Dimension scale ?

My Dim. are too LARGE, how do I deal with that?

The value indicated, or text size and so on? More info needed, screenshot, or best sample file.
Settings for dimensions are at Options - Current Drawing Preferences - Dimensions.
See the manual https://librecad.readthedocs.io/en/latest/guides/annotate.html

This is the wrong place to post. LibreCAD user or Troubleshooting would fit better.