There is a very simple way to fix such an issue, if it is still an SVG circle and has not been converted to paths.
You can engage the Circle tool, and hold down Ctrl as you click and drag one of the two square control handles. This will rescale the circle proportionally.
You can then scale the Circle until the dashes separate.
If the object has been constructed from paths or converted to paths, rather than an SVG shape, then it is also possible to deselect the Scale Stroke Width in the preferences for Transforms to enable scaling of the object to separate the dashes.
Once that has been done, you can scale the object proportionally, again by holding down Ctrl while clicking and dragging one of the corner handles, until the dashes separate. Although this is a little trickier and may require some trial and error, since the display does not refresh until you have released the mouse button.
If rescaling the object is undesirable, you could place guides around the object, rescale it to separate the dashes, then in preferences enable the Scale Stroke width, and then rescale the object back to its original size.