Windows11 64bit (22H2), display resolution 3840x2160, win scaling 150%
Batch convert / Filter dialogs
Border effect
Suggestion A
- remove extra Frames
 as it is already possible to achieve the same effect provided by 3 Frames but with 3 consequent Border actions.
 In theory multiple Frames in single action may be helpful:- if there is Presets functionality available where you can define multiple borders, but this is not a case here. One also can create global Batch convert's preset or export for NConvert.
 - Frame effects interact with each other in a special way, not avaialble when you apply them consequently. Not a case as well.
 - why exactly 3 frames, why not 4 or 5. Anyway, I doubt this feature is popular nowadays.
 
- add Frame type selector (outer/inner) and Opacity for inner frame
 type selector can be in the form of checkbox for now, but imho dropbox/radio button would be more explicit
- add Background color
 required for background under Round edges and Shadow
- add Shadow color
- make Shadow follow the Round border
Mockup
The layout of the controls is just one under the other, as I somehow don't see the complex structure in batch mode.
Examples from other apps
- FastStone
- IrfanView
- Add border/frame
 - Add Shadow, Shape, Rounded corners...
 
ps. inspired by Effects (Really importants) by Hakim Antoine Said


 Thanks to your detailed description I can reproduce
  Thanks to your detailed description I can reproduce 