What a lazy answer the Costco fitter gave you. The least they should do is ask you to come in to go over your settings in more details to see how things are currently set for you and what more can be done for you, instead of brushing you off with “It’s automatic and doesn’t have to be turned on” answer.
I’m not your fitter and I’m a stranger to you, but I’ll take the time to show you the various settings for in the Philips HearSuite software that you can educate yourself on so you can make an appointment with your Costco fitter and review your settings to see how things are set, and change anything you want in there.
The first 2 screenshots below are the various parameters that can be set and some of them are specific for noise reduction. The left and right sides are duplicates because they’re for the left and right ears, that’s all.
At the bottom are the Help explanations of what each of the parameters are so you understand them better. Notice that the whole Feature page has to be captured in 2 screenshots so you’ll see some overlap in the middle (the Noise Reduction Mode and the Speech Clarifier).
Review this to understand what all the parameters do and decide how you want them to be set, print it out, make an appointment with your Costco fitter, have them show you the screen on how your parameters are currently being set, and ask them to change any of the parameters you’d like to change to help improve your noise reduction. Generally for the noise reduction stuff, set them to High or Max if not already set to those values should help with maximizing the noise control parameters to help you out.
Note that if you’re not an experience HA wearer (you didn’t say if this is the first pair of HAs for you or not), everything may sound overwhelming at first and the “noise” may be less over powering to you as you start getting used to everything. But if you’re an experience HA wearer, just new with the Philips, then maybe the Costco fitter didn’t program the settings to be aggressive enough for you on the noise control front.