Leah, thanks for your reply, but I agree with Kenneth, the solution you offer doesn't solve my issue either.

In addition to Kenneth's example, here's also mine, if it can help.

I have 3 audience groups, A, B and C:

Admins = Andy, Ann
Billers = Blair, Bob
Customers = Cathy, Charles

My 1st article is for admins only, I'm going to create the 1st user segment with Andy and Ann.

My 2nd article is for billers only, I'm going to create a 2nd user segment with Blair and Bob.

My 3rd article is for customers only, I'm going to create a 3rd user segment with Cathy and Charles.

My 4th article is for admins and billers. I already have an Admins user segment and a Billers user segment, but Guide doesn't enable me to add multiple user segments, so I need to create a 4th user segment with Andy, Ann, Blair, and Bob.

My 5th article is for admins and customers. I already have an Admins user segment and a Customers user segment, but Guide doesn't enable me to add multiple user segments, so I need to create a 5th user segment with Andy, Ann, Cathy, and Charles.

My 6th article is for billers and customers. I already have an Billers user segment and a Customers user segment, but Guide doesn't enable me to add multiple user segments, so I need to create a 6th user segment with Blair, Bob, Cathy, and Charles.

My 7th article is for admins, billers and customers. I already have an Admins user segment, a Billers user segment, and a Customers user segment, but Guide doesn't enable me to add multiple user segments, so I need to create a 7th user segment with Andy, Ann, Blair, Bob, Cathy, and Charles.

That's how I need in total 7 user segments:

A
B
C
AB
AC
BC
ABC

I can only select one user segment:

While I want to be able to select multiple user segments: