I can't find the tablespace tab in my Schema Browser.
Tab hidden or license key does not include the DB Admin Module
1. Go go to Help | Support Bundle and see if your "Toad for Oracle Xpert Add-Ons" line states "DB Admin module." If not you'll need to contact Quest Sales (sales@quest.com) to purchase a key with the DB Admin module.
2. If you do have DB Admin module, then the tablespace node or tab (depending on your setup) may be hidden. Go to the top most database node in tree view or select any tab in tab view of the Schema Browser, right-click and select "Configure." Then check the tablespace check box to make it visible.