### Context

Real estate is increasingly a premium in our header toolbar. Especially with the addition of 'Include projects' and 'Baseline', it's got long, limiting the availabel space for long view/work package titles.

The 'Zen mode' does nothing more than activate Full screen view + hide some elements. This button does not add significant value to the user and can thus be removed. This will:

* Give us back a bit more space
* Make the toolbar that much cleaner

### **Acceptance criteria**

* Remove the "Active zen mode" button from all Begin of the insertionviews 
* \[open\] Alternatively, move the action to the three-dot More menu.
* Views include:End of the insertion Begin of the deletion views, including:End of the deletion
* Project overview
* Work package index
* Individual work package view
* Individual boards
* Individual calendars
* Individual team planners