Custom Navigation in Twitter Blue settings lets subscribers choose which shortcuts they see in their nav bar.

That said, Google also has a default toolbar in these Custom Tabs, which was spotted in development in March when Chrome feature researcher @Leopeva64 spotted flags for a new bottom bar.

Google may introduce a bottom bar for Chrome on Android, available in custom tabs from the Google app. The new bottom bar isn't functional just yet, so we don't know which features it will house ...

A recent X leak claims that Google is testing a bottom bar feature in Android Chrome, which might bring back the previously abandoned design.

Chrome for Android’s bottom address bar is rolling out widely. Users now have the option to keep the bar at the top of the screen or lower it to the bottom.