Improve Relationship Drag and Drop Experience
In Power Pivot for Excel, when you drag and drop columns to create relationships, there experience is:
1. Click and drag source column
2. Hover over destination table
3. The receiving column on the destination table is highlighted to indicate which column will receive the join.
In Power BI Desktop, item 3 above is missing. It makes it ambiguous how the join will be made (and a poor user experience). Please add a visual confirmation to the user which column will receive the join during drag and drop.
Vatsal Makadia commented
When you drag and drop a relationship in Power BI, it is not clear where the join will be made so it needs to be improved. Perhaps, it can come up as zoomed text for 'field' to allow join to be made easier.