Here are two (2) suggestions for Figma Designer to help make it a bit more user-friendly and magical to use.
Panel Expand / Collapse Animations
When toggling "Hide UI", the interface abruptly disappears and reappears (on the right side of Fig. 1a. )
It'd be delightful if the UI elements were swept away (dark green position graph) from the center of the screen and subtly faded out of sight. (light green opacity graph) as indicated below in Fig. 1b.
Responsive Panel Colors
Figma thankfully allows users to set a background color for the whole project, which is a welcomed feature coming from Sketch, which locks you into using a white background.
Unfortunately when using a dark background, the layers panel (left sidebar) and the inspector panel (right sidebar) are blindingly bright. Not only are they pure white, their typefaces and elements are thin and light.
To make the layer and inspector panels more readable, I propose that the UI of both change in accordance to the set background color of the project. I prototyped what this could look like in the column on the right.