add a "before/after on all the image" option
**Description**
Is your suggestion related to a problem? Please describe.
I like seeing the "before/after" on all the image but there is only a "toggle" option.
**Solution**
Describe the solution you'd like to see.
a new button "before/after" that deactivates temporarily all the modifications made on an image (but not only on half of it). Click back on it when you want to reactivate everything.
**Alternatives**
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[ A clear and concise description of alternative solutions you have tried or considered.]
**Additional Context**
Add any other context about the suggestion here.
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