Decide on the standing position and adjust how you play.
First, you need to decide the position to be standing in. Pick a place where you can contact your co-performers on time, and put on a piece of tape there. If you have someone who can sound check from audience seats, it helps to accurately check the sound balance.
In the meantime, check the acoustics of the stage. Use open strings and check how the sound strengthens and weakens. Depending on the stage, you might have to play very loudly or quietly to avoid sound distortion. Or, you might have to play very clearly because the sound disappears if you don’t. They are called “well reverberating” halls or “non-reverberating” halls.
You can’t of course change halls, so listen with your own ears and ask for advice from the person who’s sound checking, and adjust how you play by playing each sound longer or shorter, change the strength of your bow pressure, etc.
One of the important abilities as a performer is swiftly adjust how you play depending on where you play.