There are chrome extensions (which also work in Vivaldi) to do text-only zoom. I haven't tried them and can't vouch for them, though. Before Vivaldi added cust

There are chrome extensions (which also work in Vivaldi) to do text-only zoom. I haven't tried them and can't vouch for them, though. Before Vivaldi added customizable mouse gestures, my plan was to stick to a Firefox fork that will still support XUL addons, like Pale Moon. That's my suggestion, if the text zoom addon doesn't work and your use-case really needs that.