RGB 7e57ff purple is way outside the gamut limits of CMYK. Even a six color large format printer wouldn't be able to hit a purple like that. In the color picker the 7e57ff color is pushed to the top of the color picker square (notice the gamut warning exclamation point in the attached color picker image).
There are plenty of reasons why I really do not like Canva. One of the biggest reasons is the app deliberately promotes itself to people who don't have any training/experience in graphics production and the software pretends that any professional knowledge is not necessary. People jump into the free version of the app and it's, "hold my beer, I'm going to be a graphic designer."
One of the basic rules in graphics production is the design needs to be created with the output device in mind. If the design is something that will be printed it needs to have colors that will fit within the gamut range of the printer. All too often people will just pick colors that look the most vibrant on a computer screen. That often means RGB colors that are maxed out in brightness and saturation.
When our shop runs into a problem like this we'll sometimes have customers pick a spot color out of a physical Pantone swatch book and then print a test sample to see how well the printer can match it. RGB colors can go well beyond the intensity levels of Pantone spot colors.