Add vertical "before and after" slider to DEVELOP image adjustments

[PhilBurton]

I like the vertical slider showing "before" and "after" image adjustments for some photo editing websites.

Can Adobe add this feature for all its DEVELOP adjustments, notably for any future AI based features.

The "after" image should be visible while making adjustments, and update in real time as a setting is changed.

[johnrellis]

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LR has Before/After Left/Right Top/Bottom Split views, e.g.

I think you're asking for the divider to be adjustable left/right or top/bottom, as in this request?

https://community.adobe.com/t5/lightroom-classic-ideas/p-split-screen-divider-with-movement-capabili... 

[Suzanne Mathia]

Would the Reference and Active view in Develop give you what youre looking forTo enable Reverence view, click the “R|A” icon below the image preview area in the Develop module or, use the shortcut Shift + R. Then, either drag a reference photo from the filmstrip to the Reference view to compare with the active photo or, right-click (Control -click on Mac)  on any image in the filmstrip and choose “Set as Reference Photo” from the context sensitive menu.

you can edit the active image in real time