If TabStrip animation is set to false, TabStripTab content width is 100%. If TabStrip animation is set to true (default), TabStripTab content width depends on the content and TabStripTab.contentClassName has no impact on the width of the content.

We should not have to override css classes to set the TabStripTab content width to 100% with animation enabled. As a result we have disabled TabStrip animations everywhere.

https://stackblitz.com/edit/react-zmsekzzo?file=app%2Fapp.tsx

When using the TabStrip component with the default animation feature the width of the TabStrip content area does not span the full width of the TabStrip component. Disabling the tab animation fixes the issue.