### Steps to reproduce

* On a mobile device,

* Go to Notifications

* Open a work package


### What is the buggy behavior?

* The left/right arrows for horizontal tab navigation are redundant and, in some case, cause confusion

* <mention class="mention" data-id="42086" data-type="user" data-text="@Wieland Lindenthal">@Wieland Lindenthal</mention> reported confusing the left arrow for a back button

* The full screen button is redundant, since we are already in full-screen mode on mobile


### What is the expected behavior?

* On mobile Begin of the insertiondevices (up to tablet/md breakpoint):End of the insertion Begin of the deletion devices:End of the deletion

* Hide the left/right arrows for horizontal tab navigation

* Hide the full-screen icon Begin of the insertion

* On small desktop devices

* Hide the full-screen icon (as there is no fullscreen option)End of the insertion


### Environment information

**Edge**
OpenProject 15.0
Core build: [df3cd5049c33bebd869b426852d64fe6d3eda136](https://github.com/opf/openproject/commits/df3cd5049c33bebd869b426852d64fe6d3eda136)
Product version: [831ea039b6781edf17a7de82e3e9663f5b93c1f2](https://github.com/opf/saas-openproject/commits/831ea039b6781edf17a7de82e3e9663f5b93c1f2)

**Browser:**
Mobile Safari&nbsp;

**Language**
EN