Is there a way to get the entire sidebar to appear?
The way to make the entire sidebar appear all at once on the viewport is to reduce its size or content.
As it is, the height of your sidebar is 2367px. That’s like more than twice as large as a 1080p viewport.
That said, its definitely too large to display sidebar contents all at once on screen not larger than 1080p.
If you want the whole sidebar to appear all at once within the viewport, you may have to consider removing things so they can fit.