I just wish Bambu Studio allow us to adjust the prime tower shape more narrow or rectangular than just a big square takes up a lot of space for prints. Currently, the parameters in “Others” tap is very limited how much I can reduce overall size.
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I completely agree with you. 
However, there is already one option available: changing the form to narrow rectangular: The option is called rib walls - or, to be precise, turn them off.
Okay, changing that naturally has advantages and disadvantages. I’ll link to the wiki at the end for anyone who wants to read up on it.
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When I compare it to the Orca Slicer, it offers many more options:
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Well, I also know why Bambu does this. We discussed the Prime Tower topic just last week, looking up old statements and GitHub projects. ‘Because otherwise the Prime Tower could collapse’ - in other words, because the one-click and print mentality takes over.
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If you turn off that ribbed wall option then you can set a width for the tower. Reducing the width just makes it longer (“deeper”) though. Reducing the “Infill Gap” setting will also make it a bit smaller (lowest is 100% though). I think the latter setting corresponds to the Orca “Wipe tower purge lines spacing” option.
I believe to reduce the overall size on a more macro level one would need to reduce the amount of material used for priming (somehow)…?
What annoys the heck out of me is that it needs to build a tower out of primary material just to, for example, use a couple layers of alternate material for support interfacing somewhere up towards the top. But that’s another topic!
-Max
Exactly! Thanks @RetroSharky for saving me from typing and screen shots ;p
However, OP if your filament is very dry and you have dialed your settings right, the traditional wipe tower works just as good. Rib wall is sort of like a solution for wrong problem to be honest, but i can’t blame bambu for doing that.
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If there is enough space for the print head, the slicer should just be able to allow a shorter prime tower. When priming is needed the print can stick up between the gantry quite a bit, saving a bit of height needed on the prime tower.