How do you fix a live Power BI semantic model without opening Desktop? Open it in the Service and use TMDL View on the web (Preview, July 2026 update): script the change, preview the diff, switch to Edit mode, and apply. The fix lands on the deployed model in seconds, with no republish and no data reload.
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What you'll learn
Hotfix a measure on a published semantic model straight from the browser: script it, preview a side-by-side diff, and apply in Edit mode
Add row-level security roles by pasting a TMDL script and validating them in the service
Bulk rename across your entire semantic model with find and replace
Tell which changes land instantly (metadata only) from the ones that wait on a data refresh
Restore a previous version with Version History, a rollback safety net Power BI Desktop does not have
Covered
TMDL View on the web, the Power BI Service, semantic model hotfixes, metadata-only apply, row-level security, bulk rename, version history, ephemeral script tabs, web-first development
Tools
Power BI Service, TMDL View (Preview, July 2026 update)
Any modern browser, including on a Mac (no Power BI Desktop required)
Prerequisites
Comfort reading and editing TMDL; this is not a TMDL introduction
Write permission on a published semantic model to follow along
Working knowledge of measures and row-level security in Power BI
Resources