resizing monitor window

[rawdesigns]

I was wondering if it is possible to resize my preview window while not being constrained to its aspect ratio. I'd like my composition window to be rectangle 16:9 and my preview window square 1:1

[Zoltán]

The aspect of actual preview will be determined by the texture you preview.
After undocking the monitors, you can resize the windows, but that won't resize the textures, and Resolume will try to fit the texture into your preview monitors, with the composition aspect ratio, as that's the final texture you'll be compositing on to, so you can see what your clips would look like.