http://www.metabase.com/docs/v0.12.0/administration-guide/03-metadata-editing
This says:
Metadata for tables
Tables can either be set to Queryable or Hidden.
Is there a way to make all tables hidden in a couple clicks? Then I can then make only a few visible as needed. It’s alot of clicking to hide a few dozen tables. They don’t all fit on the screen so there is a lot of scrolling too.