Delete the "to" e mail stored

[compleo]

Is there a way to prevent an autocomplete while typing e mail addy in the "to" box?

Is there a way to delete the current e mail addys saved in the "to" box.

Checked browser settings & this is not checked,"Enable Autofill to fill out web forms in a single click".

safe mail does not do autocomplete,but proton,tutanota & scrypt are the only e mail providers i use that do the autocomplete.