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utilizo galeria de fotos en Wb17 y defino diferente numero de columnas en cada punto de interrupción, ejemplo en (320=2 Columnas) (768=3 Columnas), (950=4 Columnas) etcetera; sin embargo en WW18 no se puede ya que los cambios son los mismos en todos los puntos de interrupción. cada vez que cambio el numero de columnas en 320, se modifica igual en 768, 950 etc.

I use photo gallery in WWb17 and define different number of columns in each breakpoint, example in (320=2 Columns) (768=3 Columns), (950=4 Columns) etc; however in Wb18 you can't as the changes are the same at all breakpoints. every time I change the number of columns in 320, it changes the same in 768, 950 etc

Actualmete uso la version 18.2.0

It seems to work correct for me.
Maybe you did not set the thumbnail size to 'responsive'?

Do you have a DEMO project so I can see all your settings?

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I've tested in 18.2.0 and it works ok for me. As pablo stated, make sure you set the thumbnail size to 'responsive'.