Creatures Caves

I am coming back to C3DS after several years' absence. Steep learning curve deja vu.

My main issue is edge scrolling.
In windowed mode, the image is zoomed out but edge scroll does not work; in full screen mode edge scroll works but it zooms in too close and does not fill up the screen, large black areas on both sides.

Is this a resolution issue? or is there some other fix?

I am playing on an Acer Nitro 5 laptop at 1920x1080. It is very awkward to switch from mouse to arrow keys, as I am not playing at a desk. I have a side table that swings out over my recliner, and I use the armrest as a mousepad. So I have to drop the mouse in my lap and reach up to my keyboard to use the arrows. I really need edge scroll in window mode, or a way to fix full screen to show more of the room.

I can manage ok in the base game rooms with full screen although it is a bit of a pain. Today I added "C2toDS" metaroom and it is hopeless at full screen.

Advice appreciated. I am slowly remembering how to play, but the one thing I do remember is how helpful and kind are the members here. I was so happy to see this site is still active!