@sls 500 - Request to hide loading screen. This means that all widgets will appear on the screen at the same time.
If you have many widgets in the Init procedure without this command, you may see each one being installed separately, especially if a low baud rate is used.
At the end of the initialization process must be @hls 10 The number means how long in ms the animation is displayed

These commands are useful when reinitialization happend. If you don't clear GUI-O widgets, they are duplicated and doesn't display properly.
@cls - clear the screen
@clh - clear all hardware components
@clo - clear orientation - when you want to set the screen to the default orientation

@gse - this is a general setting (specify the delimiter character COD:0 - space, COD:1-coma TSC:39 means " ' " delimiter on i.e. TXT
@guis - screen definition

I usually use this:

@sls 200
@cls
@clh   
                                        
@gse COD:0 TSC:39                             
@guis BGC:#000000 ASR:0.4486                  
.... 

@hls 10

ASR:0.4486 is screen ratio for Samsung A13,
BGC:#0000000 means black background on home screen.

Hi !
Did you look at the manual ?

https://drive.google.com/uc?export=download&id=1vHME6ipUyjRrLCVuZMmf95xsby_sRhTt