on-screentool
nounUK /ˌɒnˈskriːn tuːl/
US /ˌɑːnˈskriːn tuːl/
A thing you use on a screen to do something.
The drawing app has an on-screentool for making circles.
OTHER MEANINGS
2. A software feature shown on a display that helps you edit or create things.
Use the on-screentool to crop the picture.
3. A virtual control on a touchscreen device.
Tap the on-screentool to zoom in.
4. Any on-screen element that assists with a task in a program.
The video editor's on-screentool lets you add text.