That plant needs no pruning, so whatever you do will be for your own aesthetic or space needs. If it is too large then prune it back, otherwise leave it be. Although you can shear an oleander bush back like a hedge, they generally look better when you take out long shoots back to the soil or where they attach to another shoot. This maintains their natural look better.
Make sure and give it lots of light indoors or it will suffer. Also remember that oleanders are poisonous in case you have little ones coming around.
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