You can set the arrowhead size for dimension lines here.

(A) Dimension line
(B) Size of arrowhead

Note: Dimension text and arrowheads are always entered in mm and as absolute values, and they behave like text when you change the reference scale.

You can select an arrowhead here.

You can choose to show or hide the dimension line here.

If a dimension line consists of a series of equal sections and this option is active, a text is issued instead of the dimension text.
You can specify this text in the Options - Dimension Line page - Display area.

In this mode, the values for the elevation dimensioning are always displayed with a plus sign
In the case of other types, the values are not preceded by a plus sign.

In this mode, the elevation symbols and values are placed where you click.