Adjusting derivative image size constraints

Omeka S
1

In Omeka Classic it was possible to adjust the derivative image sizes constraints in the Appearance settings. I’d like to give the medium thumbnail images a larger maximum size constraint in Omeka S. Is there a way to configure this?

2

You can, on lines 14-18 of local.config.php - the constraint should be in pixels.

3

And after the initial import, and subsequent change, is there a way to tell the system to regenerate?