On the field setting page add the help text
If activated for a field - an info icon appears next to the field label

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Provides the possibility to convert the help text of a field into a tooltip on the entity display.

If enabled for a field, the help text at Administration » Structure » Content types » << Entity >> » Manage fields » << Field settings >> is transferred as the value to the title attribute of the fields label div-element and an info icon is appended.

Now, you can hover over the info icon to display the help text.

We used Field description tooltip as a starting point.

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