Is there a way to pause retainer box?

Pausing panners would also work.

You could make an Dynamic Material Instance and assign one to a Retaier Box. Then you could use a material parameter to pause the animation (panner).

Also consider to lower the refresh rate of the Retainer Box if the content stays the same.

You just told me how to use retainer box. Thanks, but do you know how to pause it from rendering childs?

You’ve said that pausing panners will work, so I gave you that answer.

Uncheck “Render on Invalidation” and “Render on Phase”. The first one will trigger redraw when one of its children got changed, another one will redraw on frame event.

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