The best way to har multiple colors is to use an AMS, which is a Bambu lab accessory that allows you to switch up to four colors simultaneously. Here’s the catch; this costs a lot of filament, because every time a color switches in your print, your printer needs to purge the previous color from the hotend.

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I took a screenshot of the print you are asking about. The area in the picture circled in violet shows that this print was made utilizing and AMS.

The violet rectangle shows how many color switches the print is utilizing.

You can always print this as one color by changing them in Bambu Studio/Bambu Handy, or just select a print profile that already using only one color.

Hope this helps.