FreeCAD. It'll do everything, but you have to put some time into understanding it. Fortunately, there's are plenty of YouTube videos when you do get stuck.
ScottE
Ah, I thought you were displaying on both outputs, not switching between them, hence my mirroring comment. I suspect XFCE, not the DM, detects the output change and takes care of it. You might need to emulate that behavior with a hook of some type that you have to setup yourself with the tiling WM, and you might have to --off
the unused display. I'd be willing to bet you can find some sort of hook script out there that can do this, I seem to recall an autorandr program I used in the past where you could set up output profiles. I hope that helps, maybe a little bit.
Most major Linux distributions use systemd-resolved for DNS but there is no utility for changing its configuration.
Nor should there be. That's what the configuration files are for, and the utility to edit them is the editor of your choice.
It's just the same thing as man -k
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manpages. For many of us, it's the only documentation that existed prior to the Internet.
I use i3-wm and just set my laptop display and external monitor to their native modes manually with xrandr. Been doing it this way for years without an issue. The only time I've seen the output get chopped like you mention is with mirroring, where you have to use the lowest common mode - but I don't mirror, I set each display independently as a separate output for i3 (but on the same X DISPLAY).
I also don't use a login manager, I login to a VTY and startx, old school but simple and reliable.
It depends on what you are doing, but there are lots of viable free alternatives. In addition to GIMP you mentioned, take a look at Darktable if you do photo editing. Any piece of complex software takes time to learn.
No, it's a pointless exercise that makes no sense.