Use a dimension substyle

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On the annotate ribbon

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in the dimensions panel, make sure that arch dash

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W dash alt is the current dimension style.

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Then

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select the dimension tool.

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When you hover the cursor over the circle in the middle of the top view,

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you see a preview of the new diameter dimension.

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Click to select the circle

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and then click to place the dimension.

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The new dimension is created using the settings you defined for the subs style.

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Remember that the dimension subs style will only

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be used when you create a diameter dimension.

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If you place any other type of dimension

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using the arch dash W dash alt dimension style,

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it will be created using the settings defined for the main style.

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For example, when you hover the cursor over the ft

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arc in the lower left corner of the top view,

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you can see that the radial dimension matches

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the appearance of the other linear dimensions.

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Click to select that arc and then click to place the dimension.

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Since the main dimension style uses tick marks,

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a tick mark appears at the end of the radius dimension line.

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So you may want to create an additional dimension subs style for radius dimensions

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so that they use a closed filled arrow rather than a tick mark.

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You can create dimension subs style to apply

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unique settings when creating linear angular radius,

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diameter and ordinate dimensions, as well as for leaders and tolerances

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that way. Rather than having to create and manage multiple dimension styles,

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you can create a single dimension style that includes most of the desired settings

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and then define subs style to handle any

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special conditions for specific types of dimensions.