A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi Nathan,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, I can understand that you want to show/hide certain list items based on the current logged in user account.
In your case, since the default "All items" view will display all items, please first click on the gear icon in the upper-right corner > List settings > scroll down to create a new "Standard View" and set it as a "Personal View" so that only you can see all the items, and then delete the default "All items" view.
Then follow the steps below to create a new "Standard View" to configure to show/hide certain items based on current logged in user:
1. Enter the view name and set it as a "Public View" and the default view.
2. Scroll down to add a following filter, set the value as [Me], please note that the "Assign to" column is a "Person" type column:
3. Save the view.
The following pictures are what different users see when logging in:
Hope the above suggestion can be helpful, and please feel free to let me know if you have any concerns, I'll continue to help you.
Best Regards,
Arck