Disable indentation of quoted replies

[TippyLion28]

Checklist

• I have used the search function to see if someone else has already submitted the same feature request.
• I will describe the problem with as much detail as possible.
• This issue only contains a request for one single feature, not multiple (related) features.

App version

6.602

Problem you are trying to solve

Want to disable indentation on replies. The conversation thread gets more and more squished the higher the indentation level until it is no longer readable.

Suggested solution

Add option to disable indentation on replies

Screenshots / Drawings / Technical details

No response

[CSharperMantle]

Wanted to bring this up once more.

I'm on Beta channel, and I upgraded to v16.0b3 recently. The quoted style deteriorated drastically, rendering some emails completely unreadable.

This is what it looks like now (taken on Dec 22, 2025), notice how the box becomes significantly narrower with each level of indentation:

To compare, the previous "line+indent" style worked flawlessly on narrow mobile screen. The following screenshot was taken on Nov 6, 2025:

I wonder if there is an option to let me revert to the previous behavior?

[platform34]

I think there were regression concerns and the previous PR was reverted #9928 (comment)

A new PR #10076 addressing many HTML related issues is in the pipeline, scheduled for v16 release.
You can following and see if the release helps when it hits.