The Tap to Translate feature is very helpful for looking up words while studying, working or simply using other Android apps, but in cases when you have more than one MobiSystems dictionary installed you must set which one will be the default for the function. This is done as follows:
1. Open the Slide-in Navigational menu on the left side of your dictionary.
2. Scroll down and tap on Settings.
3. Open the Tap to Translate option.
4. Open Choose Dictionary and select the one you wish the function to use from the list of installed MobiSystems dictionaries on your phone.
Note: From Anroid 10 the feature will be depricated according to Google's policies.