Introduction:
With the release of the Power Apps Component Framework, the focus has now drastically shifted to designing a UI that is intuitive to use especially one that requires minimal clicks to get going. N: N relationships have long been a touchy topic, here, where if you would like to associate more than one record with another record, the solution was designing a native N: N relationship between the 2 tables which created an intermediary table and with that, the UI presented was that of a sub-grid that could be added to the form.
Requirement:
Over time Microsoft updated the N: N sub-grids to allow quick inline adding of the records quickly without the need for the full-blown form. And yet that has not been the ideal solution for end users that usually require the ability to go ahead and select all associated records in one go and click an ok to have them set. Since the availability of PCF, many community solutions that provide a multi-select interface for N: N records have been made available and you can browse through them at Gallery
We were pleasantly surprised to find a Multiselect Lookup control OOB with a CRM trial we were working on.

Looks like it is being shipped as part of field service (found the tech control name when it crashed and showed an error). In case you don’t find it in your environment this could be the reason...Read More