You can delete a dimension, for example, to resolve an overconstraint condition within your sketch. A dimension can be deleted using:
The Trim option
The Select option.
To delete a dimension using the Trim option:
Select the Trim
icon
.
The cursor changes to a pointer-and-trim symbol.

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Select the dimension you wish to delete. It changes to bright green.

Click on the dimension.

The dimension is deleted. The entity remains, without any change to its dimension.
Tip: To avoid unintended deletions, make sure to exit the Trim option when finished. Do this by re-clicking the Trim icon, or by clicking exit.
To delete a dimension while in Select mode:
Click the Select
option
.
The cursor changes to
a black pointer
.
Select the dimension you wish to delete. It changes to light green.
Press the Delete button on the keyboard.
The dimension is selected. The entity remains, without any change to its dimension.