Editor Window is Small After Upgrading where as the preview is Normal window size
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
Problem
Users are able to edit, but the editor does not display at full size:

Diagnosis
Environment
Confluence 6+
Collaborative Editing is enabled
Diagnostic Steps
Check for any customized page layouts: Customizing Site and Space Layouts
Check if you have any custom themes/plugins
Check if there are any site wide banner configured using the steps on How to add a site-wide banner
Cause
Some custom layouts/themes are not compatible with Confluence. You can remove the customizations to reset the layouts to default. Also, the issue can happen if there were any HTML banner introduced during the upgrade which might have some tags missing.
Solution
Resolution 1
Depending on how your site is customized, follow these steps until the editor displays properly:
Go to
-> General configuration -> Layouts -> Click on 'reset to default' (next to Page Layout)
Check for a customised page layout under Space content -> Look and feel -> Layouts
Follow our guide on How to clear customizations from Confluence
Enable safe mode
Go to
> General Configuration > Collaborative editing and disable Collaborative editing. Then restart Confluence and enable collaborative editing again.
Resolution 2
Go to
-> Custom HTML -> At the beginning of the body
Check for a banner added recently and check if there are anything missing or not right.
Remove/Add the necessary content within the HTML code.
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