1. The data set multiselects layout in graph widget doesn't look good.
I suggest increasing the width of the multiselect to fit the right edge of the elements. The delete icon is too close to the right side, I recommended making the same padding/margin as in 6.0.
Before (6.0):

Now in 6.2 and master:

Suggest:

2. Same for overrides, I also suggest increasing the width of the multiselect and move the delete icon. After the delete icon there is now a large empty space.
Before (6.0), the position of the delete icon is almost the same as in the Data set:

Now in 6.2 and master:

Suggest:

3. Missing drag and drop option for overrides