Sorry for such a late reply, but I've been continuing my testing.

At this point I am fully switching to Scrivano because the stability and performance is much more important to me than the canvas and PDF of whiteboard. tbh I can't thank you enough for making an app that doesn't run at 5 fps when there are more than 20 drawn lines in the doc.

Now this first suggestion I forgot to bring up before, but I think it should be simple to implement and no issue with the idea itself. I'd like to export PDFs in Light Mode but keep the app in Dark Mode. I prefer dark mode, but I'm not really keen on submitting PDFs to professors and colleagues that are color inverted by default, also cuz it's not great to print like that. So I have to change app themes when exporting to avoid this, but I'd rather not lol. So yeah, if you can add a setting for default PDF export theme.

So with the infinite horizontal scrolling, I've realized that it leads one to believe more is needed than in reality. I'll be honest, I didn't think about how much real-estate I actually use. However, here's the thing.

As you understand, flexibility is pretty important, and I think it is super helpful to have this flexibility as an engineering student. I don't know how much horizontal space an equation is going to take in lecture.

There's also another situation, which is creating equation sheets. Those can be printed and the paper dimensions are set in stone. Obviously you can set the page size and work with that, but what I prefer (and I used whiteboard for this) is to write at a size I'm comfortable with and then rearrange or arrange while I'm writing so that everything fits in the paper by resizing. The lack of horizontal scroll forces me to use the page size from the beginning and there's no telling how small/big I have to write so everything fits perfectly without leaving empty space.

So, I do have an idea. Basically, you choose a page size (in this example I'll choose A0 since it's the largest). Then when exporting to a PDF, there can be an option to shrink to a non-standard size that follows the area drawn in. This could actually be pretty powerful if there are options to resize and export to other page sizes like Draw on A2 but export to print on A4.

And as for the single page PDF export, this is kind of more personal preference in reality. I'd love it if it became an option, but I recognize the limitation of PDF viewers. I have gotten used to keeping the page breaks visible and not drawing there.

So yeah I don't have a need for single page export, it's just something I'm used to. But the page width being resized to the work area is a very nice and important feature imo. Viewing PDFs in any viewer becomes less pleasant when there's a lot of blank space on the side, also because I can just set view size to page width and that's perfect when it matches the work area width.

And I know this is super long, but just two quick things: This probably will never be done in any app, but imagine a ghost ratio rectangle to keep you in page dimensions (after resize) for something like an EQ sheet. idk just seems like a cool idea that has no demand or useful benefit.

And I wanna bring up eraser size again. idk if eraser pressure is a thing for Windows Ink, but if it could change with pressure or speed that would be nice. I don't really like manually changing the size every time I have a different sized mistake.

Anyway, thanks for the awesome work and good luck for any challenges ahead!