finished the upgrade to filament 4. completely revamped the frontend with codex, now it looks great!

app/Filament/Resources/Users/Pages/CreateUser.php

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+<?php
+
+namespace App\Filament\Resources\UserResource\Pages;
+
+use App\Filament\Resources\UserResource;
+use Filament\Actions;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreateUser extends CreateRecord
+{
+    protected static string $resource = UserResource::class;
+
+    protected function getRedirectUrl(): string
+    {
+        return $this->getResource()::getUrl('index');
+    }
+}

app/Filament/Resources/Users/Pages/EditUser.php

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+<?php
+
+namespace App\Filament\Resources\UserResource\Pages;
+
+use App\Filament\Resources\UserResource;
+use Filament\Actions;
+use Filament\Resources\Pages\EditRecord;
+
+class EditUser extends EditRecord
+{
+    protected static string $resource = UserResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make(),
+        ];
+    }
+
+    protected function getRedirectUrl(): string
+    {
+        return $this->getResource()::getUrl('index');
+    }
+}

app/Filament/Resources/Users/Pages/ListUsers.php

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+<?php
+
+namespace App\Filament\Resources\UserResource\Pages;
+
+use App\Filament\Resources\UserResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+use Illuminate\Contracts\Pagination\Paginator;
+use Illuminate\Database\Eloquent\Builder;
+
+class ListUsers extends ListRecords
+{
+    protected static string $resource = UserResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+
+    protected function shouldPersistTableFiltersInSession(): bool
+    {
+        return true;
+    }
+
+    protected function shouldPersistTableSortInSession(): bool
+    {
+        return true;
+    }
+
+    protected function shouldPersistTableSearchInSession(): bool
+    {
+        return true;
+    }
+
+    protected function paginateTableQuery(Builder $query): Paginator
+    {
+        $paginator = parent::paginateTableQuery($query);
+        return $paginator;
+    }
+
+    public function updatedTablePage($page)
+    {
+        $this->dispatch('table-pagination-updated', ['tableId' => $this->id, 'page' => $page]);
+    }
+
+    protected function getTableQueryStringIdentifier(): ?string
+    {
+        return 'users-table';
+    }
+}

app/Filament/Resources/Users/UserResource.php

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+<?php
+
+namespace App\Filament\Resources;
+
+use App\Filament\Resources\UserResource\Pages;
+use App\Filament\Resources\UserResource\RelationManagers;
+use App\Models\User;
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\Resource;
+use Filament\Tables;
+use Filament\Tables\Table;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\SoftDeletingScope;
+use Filament\Forms\Components\TextInput;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Forms\Components\Select;
+
+class UserResource extends Resource
+{
+    protected static ?string $model = User::class;
+
+    protected static ?string $navigationGroup = 'User Management';
+    protected static ?string $navigationLabel = 'User Roles';
+
+    public static function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                Forms\Components\Section::make('User Details')
+                    ->schema([
+                        TextInput::make('name')
+                            ->label(__('filament.resource.user.form.name'))
+                            ->required()
+                            ->maxLength(255),
+                        TextInput::make('email')
+                            ->label(__('filament.resource.user.form.email'))
+                            ->email()
+                            ->required()
+                            ->maxLength(255),
+                        TextInput::make('password')
+                            ->label(__('filament.resource.user.form.password'))
+                            ->password()
+                            ->dehydrateStateUsing(fn (string $state): string => bcrypt($state))
+                            ->dehydrated(fn (?string $state): bool => filled($state))
+                            ->required(fn (string $operation): bool => $operation === 'create')
+                            ->maxLength(255),
+                        Select::make('role_id')
+                            ->relationship('role', 'name')
+                            ->label(__('filament.resource.user.form.role'))
+                            ->required(),
+                    ])->columns(2),
+
+                Forms\Components\Section::make('Preferences')
+                    ->schema([
+                        Forms\Components\Toggle::make('email_notifications_enabled')
+                            ->label(__('Email Notifications'))
+                            ->default(true),
+                        Select::make('theme_preference')
+                            ->label(__('Theme'))
+                            ->options([
+                                'light' => 'Light',
+                                'dark' => 'Dark',
+                            ])
+                            ->default('light'),
+                        Select::make('locale')
+                            ->label(__('Language'))
+                            ->options([
+                                'en' => 'English',
+                                'de' => 'Deutsch',
+                            ])
+                            ->default('en'),
+                    ])->columns(2),
+            ]);
+    }
+
+    public static function table(Table $table): Table
+    {
+        return $table
+            ->columns([
+                TextColumn::make('name')->label(__('filament.resource.user.table.name'))->searchable()->sortable(),
+                TextColumn::make('email')->label(__('filament.resource.user.table.email'))->searchable()->sortable(),
+                TextColumn::make('role.name')->label(__('filament.resource.user.table.role'))->searchable()->sortable(),
+            ])
+            ->filters([
+                //
+            ])
+            ->actions([
+                Tables\Actions\EditAction::make(),
+            ])
+            ->bulkActions([
+                Tables\Actions\BulkActionGroup::make([
+                    Tables\Actions\DeleteBulkAction::make(),
+                ]),
+            ])
+            ->emptyStateActions([
+                Tables\Actions\CreateAction::make(),
+            ]);
+    }
+    
+    public static function getRelations(): array
+    {
+        return [
+            //
+        ];
+    }
+    
+    public static function getPages(): array
+    {
+        return [
+            'index' => Pages\ListUsers::route('/'),
+            'create' => Pages\CreateUser::route('/create'),
+            'edit' => Pages\EditUser::route('/{record}/edit'),
+        ];
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('filament.navigation.groups.user_management');
+    }
+
+    public static function getNavigationLabel(): string
+    {
+        return __('filament.navigation.user_roles');
+    }    
+}