Improve mobile usability: Hide "Start new discussion" button on mobile when editing or writing posts?

Some of our active community members suggested that the start new discussion button that hovers over the screen on mobile version of the community could be hidden when user is writing or editing a post or a comment.

Especially on certain phone models this button seems to a bit on the way when trying to post something on mobile which is off annoying for the people using the community actively on mobile.

Below example is from Samsung Galaxy S9 and Chrome (67.0.3396.87).