Right click on dimension, select Properties, select Text. Change Align to setting to Decimal Point.
Attached picture od dimenions shows 2 identical dimensions, 3.0 +0.5/-0.2. Lower one is alinged by sign, upper one is aligned by decimal point.
Gary Dinges | Mechanical Design Engineer II | Probes & New Product Development Emerson Climate Technologies | Therm-O-Disc, Inc.| 1320 South Main Street | Mansfield | OH | 44907 | USA T +1 419 525 8554 email@example.com
May even be better to do set in your dimension style and leave your OCD on this issue behind.