How can I add / remove the tool in the tool tab?

Add a tool to the tool tab

1. Select the tool tab. Right-click inside the tool tab and select Add Tool -> choose the tool you want to add from the drop-down menu. The selected tool will appear under the last tool of the Tool Bar.

2. Alternatively, go to View -> Customize Tools -> Add Tool to selected tool tab-> choose the tool from the drop-down menu.

Removing tool from the tool tab 

1. To remove any unwanted tool from the tool tab, right-click on the Tool Tabs bar. Go to Remove Tool and select the tool that is not needed.

2. Alternatively, go to View -> Customize Tools -> Remove Tool from the selected tool tab-> select the tool that is not needed.