You have the following:
| Methods | route |
|-----------|-------------------------------------|
| POST | panel/investments/flats |
| GET/HEAD | panel/investments/flats |
| GET/HEAD | panel/investments/flats/create |
| GET/HEAD | panel/investments/flats/{flat} |
| PUT/PATCH | panel/investments/flats/{flat} |
| DELETE | panel/investments/flats/{flat} |
| GET/HEAD | panel/investments/flats/{flat}/edit |
Since the only parameter is {flat}
you can only rename this one as per docs:
Route::resource('flats', FlatsController::class)->parameters([
'flat' => 'apartment'
]);
This results in:
| Methods | route |
|-----------|------------------------------------------|
| POST | panel/investments/flats |
| GET/HEAD | panel/investments/flats |
| GET/HEAD | panel/investments/flats/create |
| GET/HEAD | panel/investments/flats/{apartment} |
| PUT/PATCH | panel/investments/flats/{apartment} |
| DELETE | panel/investments/flats/{apartment} |
| GET/HEAD | panel/investments/flats/{apartment}/edit |