Develop module, left-hand panel, History. Open up that section and you'll see a list of adjustments you have made, the most recent being at the top of the list. Choose the step you want to return to and then start making adjustments. Everything above that step will be replaced.
Thanks Jim. If I understand you there is no way to change or delete a lower
adjustment without affecting the adjustments above it in the history?
George E. Givens, Jr.
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Of course there is!
You don't have to delete an exposure +1 step somewhere in the middle,just change your exposure to something else.
The history step +1 will always be in the history list but it's completely undone (or changed) and all your other changes are preserved.
To phrase it a bit more instruction-like:
Use the history panel to look up what you did in the step you would like to erase.
Then go back to present history state and do exactly the reverse.
This may also mean deleting a graduated filter or an adjustment brush action.
There are some other, broader, methods for making use of your History - without destroying the intermediate operations - (beyond just referring to it, to see what you previously have done).
First, if you click on an eariler History step, the subsequent History steps are still there, but greyed-out. Importantly, they remain accessible only for so long as you do NOT make any new edits. Doing so would branch off a fresh, alternative image History which sets off starting from that earlier point - and excludes (erases the memory of) all these subsequently done operations. So it is important to avoid doing that, and to remember to take your history "back to the future" at the first opportunity.
So, worked example: you edit the image up to point A, where you mess up the WB, then edit it some more up to point B. Then you roll the image's History back to the last step just before point A, where the WB is as you want it, and Copy (just the WB) to the clipboard. Then you roll the image back forward to point B and Paste, assigning your image (which keeps all its other settings up-to-date) the same WB that it formerly had, just before you messed that up.
In Develop, try pressing and holding the Shift key and the Reset button at bottom right will change to "Reset (Adobe)". Click on it. Does the image now revert to the original unedited state? If it does, it means you've probably changed (inadvertently or intentionally) the default develop settings. You can reset those if you wish by going to Develop on the Menu Bar, select "Set Default Settings" and choose "restore Adobe Default Settings".
You don't mention what you were trying to "undo" or why you wanted to do so. If you can provide more details we will be able to provide better suggestions. Everyone so far has provided "generic" solutions without knowing your "real objective.". My guess is that you were trying to create B&W images and then wanted to "undo" those control settings, but that's just another "guess." Please also provide the version of LR (3.6, 4.3, etc.) and operating system you are using (Windows 7, OS X, etc.).
As jim01403 has pointed out it appears you have an issue with your LR Develop module "default settings." Until this is resolved you will continue to have "unexplained" things happening in LR.
1) Open LR Develop module and click on the upper toolbar 'Develop' > 'Set Default Settings,' then click on 'Restore Adobe Default Settings.'
2) Try adding some "new" image files and see how they look in the Develop module after imported.
3) If the images still don't look right (i.e. B&W, etc.) then we will explain how to delete the LR 'Preferences file, which may have become damaged. This forces LR to create a new default Preferences file the next time the it is launched.
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