i do not see animation tab

animation tab is shown on the window

need more information please, is this in Impress? what are you trying to achieve and how are you trying to do it? perhaps a screenshot will help.

In the sidebar, which is normally to the right of the window/screen, are some icons, one of which opens the Custom Animation deck. On the system I’m writing this on, it is a yellow star. There is also a set of 3 vertical dots at the top right of the sidebar which, if clicked on, give a menu which includes Custom Animation, click on that entry.

I hope this is what you’re looking for. Cheers, Al