Libreoffice graphical/screen issues

I use lubuntu 20.10 with libreoffice
Often when i open new office pptx i can click the slides,
After resize window, then i can click it,

Other doc like docx, the window display goes blank, i guess this is an old problem? I have to resize it then it will fix,

I see in libreoffice option, hardware acceleration is enabled,

Maybe the problem exist only for microsoft format?

Any suggestions? Thank u

can you write more details about the problem because I personally didn’t understand where is the problem with your presentation?