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The size of the arrows etc is controlled by the options->current drawing preferences->Dimensions.
Just fool around with the settings untill you get what you want.
The dimension text will not appear if the "Draft" button is pressed. This is a little button that looks like a pencil pointed into a corner. It's a toggle, so if there is just a box where the dimension text should be, just press the button and your dimension should appear.
If the mouse doesn't seem to work when doing dimensions (i.e. you have to input on the command line) you probably need to play around with the "snap to" settings on the bottom of the screen. if you hover over the icons it will tell you what they are. I found that activating "snap on end points" and "free snap" at the same time worked best for this.
Don't feel bad, I worked on this for hours trying to figure this out. Hence the post. Hope this helps
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