Press button+pen up and down for zoom in an out?

[Michelist]

Hold CTRL + Space and then press your LMB or put your stylus on the canvas, and then you can zoom via up and down movement of your stylus or mouse.

But there is also a plugin to freely set buttons and directions, if you want me to, I can search it for you.

Michelist

Edit/Add: Found it. It is from @AkiR and I only put it together so it is a ready installable plugin, you can download it from the linked post, and the description is in the posting above mine.

How to using zoom Ctrl + MMB like in Photoshop?

@AkiR: Since you offered your work openly, I was so cheeky to put your parts together, so the less computer-savvy can download your plugin as an already installable package that can be imported via Krita’s standard plugin import function. It can be downloaded via this link: cursor_zoomer_plugin.zip ¹ You install plugins in Krita by clicking on “Tools” >> “Scripts” >> “Import Plugin from File” and in the dialog that opens, select the file you just downloaded, confirm the selection (click on t…

The easiest way to install plugins in Krita is to go to “Tools” >> “Scripts” >> “Import Python Plugin from File…”, then in the dialog that opens, specify the path to the plugin, so browse to the downloaded ZIP on your PC or Mac and select the ZIP file you just downloaded and confirm the selection (so, usually, click on the OK-Button), confirm the next dialog box as well, then restart Krita and then, depending on the plugin, set up the plugin to your liking or use it right away.