How to customize Lightroom masking panel?

Hi James, just to clarify - you’re currently using the new version 16 of Lightroom Classic (not cloudy/desktop/ecosystem) and wanting to customise the masking edit panel - is that correct? And I’m guessing you’re on a PC not a Mac as you mention control and not command? Let us know and we can go from there. 

Hi jamesn21002716, the workflow you are describing — Control-clicking a panel header to get a menu with Solo mode — is documented for Lightroom Classic, not for Lightroom (the cloud-based desktop app) 16.0.

In Lightroom Classic, you right-click or Control-click any panel header and choose Solo mode, so only one panel opens at a time. See Workspace basics in Lightroom Classic: https://helpx.adobe.com/lightroom-classic/desktop/workspace/workspace-basics.html

In Lightroom (cloud-based), the Masking panel does not offer that same Control-click panel menu — which is why nothing happens when you Control-click an adjustment section there. The Lightroom Masking help describes working with masks and their sliders, and right-clicking / using the three-dot menu on a mask itself (for example to rename, invert or intersect it), but it has no panel-customization or Solo mode step: https://helpx.adobe.com/lightroom/desktop/edit-photos/masking.html

So this looks like a difference between the two apps rather than a setting you have missed. If you would like that panel customization in Lightroom (cloud-based), please consider posting it as a feature request — and if you do use Lightroom Classic, the Solo mode steps above are the way to get the one-panel-at-a-time behaviour there.