Does anybody know what's going on with the timeline?

So, every time the display is messed up. Basically, the scroll up/down wheel is now just 2 arrow buttons allowing me to scroll between timelimes. This would work, until I make the video too long, then the scroll left/right blocks the buttons, and then I can’t move between timelines and thus cannot add music into an audio timeline. Someone please help me.

Does the suggestion in this thread help? The timeline is down there , i don't know how to resize it

Epic thank