In the Schema Browser I do not see the option to select a tablespace object.
RESOLUTION 1:
Check the license key options if the DB Admin module is included in the key. (Go to Help | Licensing, from the main menu and if in the License Details section does not have Options: DB Admin Module included, the key does not have the add-on). If it is not included, tablespace features are disabled.
RESOLUTION 2:
Right-click among the icons for the Schema Browser and select Configure. Sort the names alphabetically and locate tablespaces. Make sure the check box is checked for visible.
