2) When writing a message TheBat! goes, I don't how, automatically in selection mode of the whole message, the only way I found, so far, is to save the message as a draft and then edit it again. I tried to click outside the selection area but no area seem to be active. See https://drive.google.com/file/d/1EuoHZhs9281vyNa8tpZ0MjqamHxSAPTp/view?usp=drivesdk
I have experienced your 2) point as well in this version.
The superiority of the software and the fact that I know there are real human beings behind it put oddities like this low on the list of things I let into my annoyance wheelhouse.
Nevertheless, I don't have a solution, only confirmation.
1) In Options -> Preferences -> Viewer/Editor -> HTML Viewer there is an option to set the minimum font size, you can try that.
2) I almost always use the plain text editor and on the rare occasion I use an HTML editor I never experienced this problem, but you could try using the alternative HTML editor. In recent versions there are two HTML editors, "PureHTML" and "RichText", they can be switched on the fly using the status bar in the editor window (or Ctrl+1, Ctrl+2, Ctrl+3 shortcuts), and more permanently set in Options -> Preferences -> Viewer/Editor -> HTML Editor.
Miloš Radovanović wrote: 1) In Options -> Preferences -> Viewer/Editor -> HTML Viewer there is an option to set the minimum font size, you can try that.
Also, standard zoom in/out moves (two fingers on the touchpad, Ctrl + mouse wheel) should also work in the message viewer.