Hey there! I submitted a feedback request within the app as well, but thought I'd add it here as well. At least on the iOS app, it's not possible to zoom in/out by double tapping/tapping + dragging up/down, and it would *really* be appreciated. At present the only way to do it is to let go of the handlebars and zoom in/out with two hands or, less dignified, use my nose to tap and drag. The latter works and keeps my safety intact, but my dignity, less so...
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Believe it or not you can do it with one hand – but it’s not documented so no shame in asking!
On iOS, tap with two fingers to zoom in, three fingers to zoom out.
(I should write some more docs…)
Are there similar shortcuts for Android?
I found that a tap with 2 fingers zooms out, but I could not figure out how to zoom in (beside 2 finger spreading, which often unwantingly also rotates the map)