Issues with repetition

I would like to group all the repetitions shown via screenshot in, if possible. I know it's somehow possible to group them into "one measure" and it just looks like a repetition with a 6 above it, but i can't for the life of me figure out how. I could just write a 6 above a regular one-measure repetition, but i would like it to also reflect in the playback. How can i acheieve this?

Please be detailed in your explanation if possible or provide a screenshot. Thank you very much.