Much like Safari when it got the Liquid Glass update, Orion also has the wasted sidebar space bug in fullscreen mode upon getting the Liquid Glass update.
Alas, Orion doesn't fix the problem when it's in windowed mode like Safari does.
Compatibility mode, and rebooting Orion and my MacBook did/do not help.
I attached images of both Safari and Orion with their sidebars to visualize what I see and mean.
On another note, I like how Orion looks with Liquid Glass.






I expected the sidebar to productively use the entire vertical space it occupies instead of having a blank area above it.
Version 0.99.137-beta (WebKit 623.1.8.0.0) Build date October 24, 2025 MacBook Air (macOS Tahoe 26.0.1 build 25A362)
Tahoe (26)