I suggest to redesign the HUD.
Even if you can close it with the slider button, it takes to much space on the screen, blocking the view. Especially when you walk on a market and want to check the different nests and Meeroos.

The single windows are mostly blank space showing mostly the background texture of the HUD,

That wouldnt be a problem if the HUD would be resizeable, but it isnt.

positioning the various buttons on the left side, with opening windows to the right, would be much better.

And there is no need to show all different buttons when a window is open. One small "close" area should be enough to close the actual window and bring back the menu tabs.

Please discuss this issue in ypur team.

Thank you.