Since the game uses a Glide wrapper (Nglide a program that converts glide calls into directx calls) , the game is also set to use Glide as its 3d rendering system, now sadly the hud was one step below full screen size simiar to how Duke3d and shadow warrior would change their huds to a more screen friendly version as you expanded it (doom would something similar and modern source ports of doom do this as well)

but sadly the outlaws glide renderer does not support screen resizing and thus just ran at full size so to speak so the bottom hud bar is hidden, the only way to get it back to switch the render back to Direct3D mode but since gog launcher (the automated script gog uses for some of its games) will just force the glide mode back on, so just run olcfg.exe as admin in the install dir and you can set the render to Direct3d however its buggy on modern windows and in my tests did not run at a satisfactory framerate as older D3D protocols are removed in new directx versions and some drivers have out right dropped support for older pre directx9,10,11 d3d rendering.

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