Add Scaling switch to gantt chart

Hello everyone,

I have a issue that
I need a button when i clicked it, i can scaling switch of the gantt chart ( because in my one column can have many “task” and i fixed row is 100px ) so i need scaling switch to see full of one row.
Sr for my bad english

There is no scaling feature for the whole Gantt.
We have the zoom to fit sample that works for the timeline:
And I have a sample implementation of something similar for the grid:

If you need something different, please send me a mockup(pictures) that will show how it should work after you click on the button.