Issue
It is underlined by a green line. I want to change the font size of the tab's title.
How can I do that?
Solution
Eclipse uses CSS for its own styling, so you can modify the CSS file to your needs as explained here.
The CSS file is located in
ECLIPSE_HOME/plugins/org.eclipse.platform_X.X.X_V.XXXX/css
and the class for the tab titles is named MPartStack.
Answered By - alex
Answer Checked By - Pedro (JavaFixing Volunteer)