How to extend the width of Project Dropdown list in Issue Navigator
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
Please note that Customization of JIRA is beyond Atlassian Support Scope
Sometimes we might have projects with very large names and similar beginnings, so when searching for the relevant project in the Issue navigator drop down will be an issue as it has a limited width.

Solution
Go to the Edit Announcement Banner page.
Add the following CSS script to modify the behavior of the dropdown:
<style type="text/css">
form#issue-filter .check-list-select{
min-width: 500px;
}
</style>
You can change the min-width: 500px; to the width of your preference.

Other Resources
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