JPG files from other programs always open Camera Raw

It’s inconvenient but simply click the Open Image button bottom right after ensuring  8bits/channel is set for jpegs. That sends the image into the regular Editor where you can continue making adjustments.

There is a similar issue with jpegs that have already been opened in camera raw. Those files always open in ACR, even if opened from the organizer.

The solutions are to save for web or in png format. You can save back to jpeg from png. I suppose that may work the same in the Capture One situation.

For a lot of files, saving to png and back to jpeg may take time. With the organizer you can batch export to png, enter in the catalog and export back to jpeg.

https://support.captureone.com/hc/en-us/articles/360002424097-Stopping-Capture-One-to-generate-TIFF-or-JPGs-from-opening-in-Adobe-Camera-Raw-instead-of-Photoshop

https://support.captureone.com/hc/en-us/articles/360002627737-Opening-images-in-an-external-editor

https://support.captureone.com/hc/en-us/articles/360002627457-Using-External-Editing