How to reduce time of showing the undo-icon when deleting mail?

[ComeUnder]

Hello,
if i delete a mail then it shows the undo icon in the lower right of the screen.
After some time the icon changes to new-mail-icon.

How can i reduce the tim how long the undo-icon is displayed?
Or better always show the new-mail-icon in parallel instead of hiding it.

Reason: If i open the app to write a new mail the i often see that there are mails that are not longer needed. And aftere i removed them it takes somw seconds before i can click the new mail icon.
(The some seconds feel like "endles" :-)

Thanks

[mikeone]

There is no such option available.

Anyway, just move on and the "undo-button" should disappear instantly.

[ComeUnder]

The trick is to click on the message. Then it disappears instantly.
Took me 1 year to find this out. lol
 

[hpg38]

or refresh by dragging down.