How to remove the fixed side bar displayed on the right of a User story template content ?

[CSE]

Hi, I become crazy with the enormous side bar of user story tickets in JIRA.

It reduces the content of the us which is the main part of the page I work on.
On a laptop, it is painful for the eyes.

Would you know how to change the settings to remove or at least reduce the width of this side bar.

Thanks a lot

CSE