Answer:
Gray square; thick black line
Explanation:
Design view helps in designing and organizing the database through tables and rows. It is here, one can set up and construct the tables, reports, etc. to organize the data and also edit, insert, and compose the fields.
As per the question, at the time of dragging a specific field in design view for moving it, a 'gray square' would exhibit to the left of the name of the field on the pointer and a 'thick black line' will signal/indicate the new position.