Layout changes from fluid to fixed when switching tabs within an epic

Summary

I've found a little bug when having set the "layout width" in the preferences to "fluid", i.e. it changes from "fluid" to "fixed" when switching between the 2 tabs within an epic.

Steps to reproduce

• Go to preferences and set "layout width" to "fluid" --> save
• Open an epic, e.g. &3900 (closed)
• See, that the page is using the fluid layout
• Switch to the "roadmap" tab
• Switch back to the "epics and issues" tab

What is the current bug behavior?

The layout of the page changes to the "fixed" width layout.

What is the expected correct behavior?

It should stay in the "fluid" layout.

Output of checks

This bug happens on GitLab.com