To remove objects from catalogues:

1. Select Tools > Object Store.
2. If you want to remove objects from the default catalogue, it is already selected and the objects are displayed in a tree structure within the 'Content' panel. Until you select one or more items in the catalogue, they are marked with a white cross on red.
   
3. To remove objects from another catalogue, select another option from the 'Catalogue file' drop-down list. That catalogue's contents are now displayed.
4. Select one or more objects by clicking on them in the tree. All selected objects are marked with a white tick on green.
   
5. Click Remove to remove the objects from the catalogue.
6. When prompted, confirm or cancel the deletion by clicking Yes or No.
7. When you have removed all the objects you want to, click Close.