Water Droplets Forming Inside AC with Irregular Air Flow
Ok, you don’t understand the modes of operation.
Dry mode will remove humidity thus making the coils cold attracting moisture, the cold may cause the condensation you are observing.
Run the system normally if you want cooling run it in that mode, heat should never produce moisture inside but may build up on the outside unit and then it will go into defrost.
When in cooling mode if your inside unit ices up the filters are the normal thing to check and if dirty the low air flow will cause icing.
If you have clean filters of the proper type the inside unit should not ice up. Putting in high end filters that filter everything out can reduce the air flow and cause icing.
Use the filter type recommended by the installer/ manufacturer.
If the above precautions of a clean filter / proper filter are observed and the system is icing up there is a problem with the unit it could be under or over charged, one of the temp/pressure sensors failing since an inverter type.
You said it was not leaking but if the drain gets plugged with mold (a common occurrence in the cleanest homes) you should be allowed to clean the drain pan and use an approved mold inhibitor to prevent mold from blocking the drain and it overflowing.
With all the above in dry mode I would expect the unit to collect moisture ( the brands I install do).