To just hide it in the editor (but still keep the actual text objects), see the answer of @sasmus.
If you don’t want any values to appear on the silkscreen, deselect the top/bottom values in the Board Setup dialog:
However, this is actually the default setting so I suspect it’s not what you’re looking for.
If you want to remove individual text objects completely, just select them and press the Delete key They can be restored with a right click on the device and choose Reset All Texts.
To delete all value texts, temporarily hide all layers except Values Top/Bottom, select all text objects and delete them.