PCA all Sentinel 2 bands

I am new in SNAP and I am trying to do PCA of all the S2 bands, but they don’t have the same number of pixels so I guess I have to rescale them, but I don’t know how to do that neither. Can somebody help? Thanks.

Always look in SNAP’s Help. It has a wealth of useful information. For example, in Help/Raster/Geometric/Resample, you should find:

Resampling Dialog

Here you can resample a multi-size product to a single-size product. A multi-size product is a product in which bands are of different sizes and/or resolutions. This can be useful for those instances when a SNAP feature is not supported for a multi-size product.