Adjustment of Desikan-Killany atlas

Hello,

I'm analyzing one patient's MEG data, and I want to calculate the source and connectivity using Densikan-Killany atlas.
The system didn't register the atlas correctly on the patient's brain surface, because the patient's right frontal lobe has been resected.
Can I adjust the atlas manually to fit the patient's brain, or is there any other method that can fit this problem?

This is common (and expected) for anatomies with large deviations from standard templates.

In the Scouts tabs there are tools that will allow you to modify (add, remove, grow, shrink) scouts as you need:

https://neuroimage.usc.edu/brainstorm/Tutorials/Scouts

Since the Desikan-Killiany atlas is provided a default atlas, it is not possible to modified directly.
Use the menu entry Atlas > New atlas > Copy current atlas to create a copy and edit it.