The Figma boards I work with (on Mac) are very wide and tall. The slider navigation is just too hard to grab on the bottom of the screen when there are other menus popped over, and it disappears into the board and into the images, perhaps there could be a setting allowing the user to change the color to meet their current visibility needs. 

It would also be nice if the right and left menus could be easier to fully minimize out of the way (without using the permanent setting to remove them from my view). I am not always working on an external monitor and on the 14” screen these take up almost 4” of the design window.