It's because the 'Index table engine' is choosen, it automatically hides those options, as those are not used by the index table engine.
The way to resolve it is to choose the 'Regular engine', then the 'Search in content' and the other options will re-appear, then when you configure them, just change it back to the 'Index table engine', and then save the options. Hopefully that should do the trick.
I will make sure to implement a solution to the upcoming release as soon as possible, this is way too confusing – I completely forgot about the problems when using the index table engine.Best,
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