Before you proceed, you need Spaces installed on your phone.
How to remove/delete a Tab?
Step 1 - Open the Space and navigate to the Tab that you want to remove/delete.
Step 2 - Click on the name of the tab.
Step 3 - You can see the information about the Tab. Click on the Settings icon.
Step 4 - It would open up a pop-up where you will see the Remove tab at the bottom left of the screen.
Step 5 - It would open a confirmation screen "All the data of the tab will be lost. Are you sure to remove tab?" > Click on Remove and you are done.