Here is how I would draw your example:
Create a blend (any number of steps) between two circles of identical (and required) size
Create a curve/line
Activate the blend docker
Select the blend group of circles
click on the path button in the blend docker
click on the recently drawn curve/line
Make sure 'blend along full path' is unchecked.
Select fixed spacing and feed in a value, say 5mm
Press 'Apply'
If you now select the last circle in the blend group you can drag it along the path curve creating many equaly spaced circles.
HTH
Peter
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