Grimoire use ??
Where is the reject all drops option ?
should probably have asked in the help section.
Anyway you can do it with the reject non-whitelisted items in the 'item' tab
There's also the Options menu, which can be accessed through:
1. Clicking [Grimoire] on the bottom left corner
2. Clicking [Options] in the list of menus that show up
3. Checking the [Reject all Drops] checkbox that shows up.