Turn Off Automatic Updates to the Report Preview to Edit Reports Faster (Generally Available)
Where: This change applies to Lightning Experience in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
How: To turn automatic preview updates on or off, flip the Update Preview Automatically switch on or off. When on, the report preview updates automatically after each edit you make to the report. When off, a message tells you whether the preview shows your most recent edits and provides the option to refresh the preview. When hiding recent edits, the preview turns gray.
To refresh out-of-date data, click Refresh (1).
The preview reloads to show your edits.
The Update Preview Automatically switch does not affect the report run page.