I move around very much and as such at many instances I have to use my mobile to access my website.
I've done about 3 installations of Composr and in the most recent install I notice that the "editor" icons are missing on edit textareas when I'm on mobile (view). This wasn't so in my previous installs.
The web host for the install in question is different from the ones I'd been using before, so I don't know if this could be the issue. I've used Chrome and Firefox and the results are the same.
However, I have moved the site to the host I was using previously, after the installation.
I've attacked two screenshots - the first what a textarea looks like on my site (taken from the edit comcode page screen) and the second what the "add forum topic" textarea looks like here on conpo.sr (on mobile).
Archive.zip Archive.zip

If your browser width is less than 500 pixels, this CSS in the default forms.css will hide the editor buttons:
I don't believe that's anything new, perhaps before you had a wider screen somehow.

You can change the CSS to un-hide it if you like. I don't think the vast majority of smartphone users are going to want to do Comcode editing, and it vastly complicates the UI, that's why it's like this by default.

Chris Graham said

I don't believe that's anything new, perhaps before you had a wider screen somehow.

From “Post #3722”, 21st Jan 2018

I'm using a new phone, that must be it.
I'll try your suggestion.
Thanks.

Thank you! the solution fixed the problem for me