This is a Wokwi simulation, because I wanted to see what the servos do.
It is the same sketch as in your first post, without any changes.
To be able to move servo motor slow, its position is often updated every 10ms or 20ms. Here is a example, start the simulation and press the buttons and turn the potentiometers: https://wokwi.com/arduino/projects/305087394119418434