Steps to reproduce:
# Create a 3D project
# Add 3D Object -> Cube
# Window -> Search -> New Window
# Change the window view to the "Table" view
# Find "+" (Add column) button
# Add selected column from the list
# Observe that the selected column becomes added to the window view
# Repeat the same action several times
# Observe that the same selected column becomes added as many times as you selected it

Expected result: The column should be selectable and added only once. What is the value to have it n times in the same window? So at the beginning item/column should be displayed as active so that the user could select it, but later if it was already selected, so in the list, it should become as not active, and the user won't be able to select and add it again. If a column becomes removed from the view, it becomes active in the selection list again.

Actual result: Column becomes added as many times as it was selected. Added screenshot in the "Attachments" section.

Reproducible with: 2021.3.25f1, 2022.2.19f1, 2023.1.0b17, 2023.2.0a15.

Note: This bug is a usability issue and would be more like a feature request to update columns adding workflow in the "Search" window.