@sns ,
- Currently, we could only check customization on three below levels:
Migration Assessment Scan: Custom Permission Level
Migration Assessment Scan: Custom Profile Property Mappings
Migration Assessment Scan: Customized Pages - Managed metadata columns are typically migrated, however support will depend on the migration tooling you select, such as SPMT, which supports the migration of content types and term stores. During migration, the default master page should be set on all sites that are migrated.
Review the report and determine where you can move away from custom master pages before you migrate.
If you have custom master pages assigned to sites, you will need to set the Master Page property on the new site after the migration has completed. In the check out file report, only checked-in content will be migrated. To avoid any potential data loss, encourage users to check in their files prior to migration. A site administrator can check in a file for a user, however only the content that was saved to SharePoint by the user would be migrated - if a user downloaded the file and was working on it outside of SharePoint, those changes would not appear post check-in.
More information about how to scan report results:
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find designer settings option under site collection settings, PFA