If there is a breakage of the countertop at the connection part between the corner cabinet and other cabinets, it can be handled as follows:

Method One:

1. You can increase the width of the Roman column / sealing board / closing board 

2. Then modify the distance from the wall to the depth

3. Generate the countertop and then change back to the original size and position;

Method Two:

1. Right-click on the wall - all countertops - countertop installation - input 20 for the left, right, and front extension parameters in the countertop editing.