On a grid grouped by one or more fields, provide an option for end users to expand/collapse all rows at will. The following image is a suggestion of where this option (most likely a button) should appear:
Hello Enzo,
Thank you for the provided screenshot.
A feature request for the desired functionality is already been logged in our public feedback portal: blazor Grid Grouping Expand/Collapse All. With that in mind, I'm changing this item status to "Duplicated".
In the meantime, a possible alternative is to control collapse/expand groups through the Grid State. An example of the approach you can see in our KB article: Collapse Grid Groups by Default.
Also, you can subscribe to the item to get notified via email for any status changes.
Regards,
Tsvetomir
Progress Telerik
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