How to extend the width of Autocomplete Dropdown list in Issue Navigator for Advanced Option
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
To increase the width of the dropdown menu allowing for full display of results with longer value that initially exceeds the original width size.

Solution
Go to the Configuring an announcement banner page.
Add the following CSS script to modify the behavior of the dropdown
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<style type="text/css"> .atlassian-autocomplete .suggestions{ min-width: 1366px; } </style>
You can change the min-width: 1366px; to the width of your preference.

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