Need help. Can't see all of the photos in film strip at bottom

I can see the same if my interface window is markedly reduced in size- then it does not show the entire filter line. (see my screen-clip).

Check by expanding your LrC interface to full-screen- Press [Shift+F] 

There is a scroll bar at the bottom, you slide the scroller to the right or left.

@focused_Coral5E46 please help us out, as we are trying the help you. Do not entitle your message as "I'm having a problem" or similar because that doesn't tell anyone anything; everyone who posts here is having a problem. The forum would be useless if every post was entitled "I'm having a problem" "I have a problem" etc. Use a title that briefly describes the problem, such as "Can't see all of the photos in film strip at bottom"

In a first step try to reset the preferences of Lightroom Classic:  How to reset Lightroom Classic preferences (adobe.com)

It's recommended to backup your preferences before you reset the preferences to the default settings: 

https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html

See also here: Gelöst: Filmstrip got cutoff in the last couple versions - Adobe Product Community - 15313490