We have over 200 Mail Merge templates.  Up until May 30, 2020 we could search for a template, then do a Mail Merge.   The search function has been disabled.  Mail Merge template search still works when in the template creation workflow, but not when trying to merge a finished template.

ZOHO CRM    -  Setup>>Templates>>Mail Merge>>Search (upper right corner of screen) still works

ZOHO CRM  -  Deals>>Select Deal>>Mail Merge>>Template drop down list appears - but the only way to select a Mail Merge template is to scroll through all the templates.  There was a search function but coincident with the release of the Writer upgrade, it disappeared.  This is unworkable when you have over 200 templates.