Hi guys,
I already changed My messaging interface but there is one more thing I would like to change if possible.

It is hidden in Read messages(Archives) or To: me and To-do so I would like to do the same in New messages(Inbox) but can't find how.
A little code modification.
Line (around 29) removed <button class="oe_full" title="Open the full mail composer"><span class='oe_e'>&amp;ograve</span></button/>
Line (around 43) modified:
Before:
<div t-if="widget.show_compact_message and !widget.show_composer and !widget.options.readonly" t-attf-class="oe_msg oe_msg_composer_compact #{widget.thread_level and widget.options.display_indented_thread > -1 ? 'oe_msg_indented' : ''}">
After:
<div t-if="widget.show_compact_message and !widget.options.view_inbox and !widget.show_composer and !widget.options.readonly" t-attf-class="oe_msg oe_msg_composer_compact #{widget.thread_level and widget.options.display_indented_thread > -1 ? 'oe_msg_indented' : ''}">