I don't have the roto brush tool the icon also is not appearing between the brushes

Hi Aya, the name and icon of the Roto Brush tool have changed. It's now called Object Matte. You may need to long-press the second-to-last tool in the toolbar to access it.

More details here: https://adobe.ly/4bp3JBZ

If that doesn't help, could you share a screenshot of your toolbar so we can take a closer look?

Thanks,

Nishu