Please make font-size adjustable in new Franz. I can't see anything, it's so big compared to Franz 4!
This is already implemented. Are you on Windows?
I'm using Linux client, and couldn't see that option. Tried also with ctrl+-/+ and scrolling, without luck
Perhaps you use the wrong +-, the ones from the Numpad don't work (for me).
I second the feature request re Ctrl++ / Ctrl+- / Ctrl+0 (zoom in / zoom out / actual size). Could look somewhat like this:

I am on ubuntu and would also like this feaure
Adjustable font does not work. (For me on Ubuntu 18)
Adjustable font size doesn't work on MacOS Mojave either. I've tried with Slack and MS Teams. The menu options are there, they just don't do anything.
I'm having the same issue on MacOS Catalina! I'm using Mozilla Firefox as my default browser and that may be the cause. On another computer running Chrome as default browser (and MacOS Mojave) it worked like a charm, but on mine with Firefox nothing happens 馃槥
This issue is fixed for version 5.5.0 (via PR #1668). We need to wait for the v5.5.0 release now.
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I'm using Linux client, and couldn't see that option. Tried also with ctrl+-/+ and scrolling, without luck