Hi @arey yaar
Seems it is a known issue. have a look in these 2 links.
https://www.servicenow.com/community/developer-forum/ui-builder-not-saving/td-p/2469866
https://www.servicenow.com/community/itsm-forum/new-landing-page-in-agent-workspace-ui-builder-not-s...
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Dr. Atul G. - Learn N Grow Together
ServiceNow Techno - Functional Trainer
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