Alter Index
To alter an index, select a table from the Object Browser,
1) Click on "Manage Indexes" icon, or
2) Right click on the table(in the Object Browser) and select the menu option "Manage Indexes", or
3) Press F7 key.
This opens up an Alter Table tab with the focus on Indexes sub tab.
Index Name: The Index Name is displayed. You can alter the Index Name.
Columns: Check/Uncheck the checkbox against the column name to include/exclude the column from the Index.
Click Save to make the changes. Or Click Revert to Cancel changes.