Q: How to clear the old Orion Servers out of the SWQL Studio App 'Server Name' List?

Your path might be slightly different, but that info is stored in the user.config file.

C:\Users\<username>\AppData\Local\SolarWinds_Worldwide,_LLC\SwqlStudio.exe_Url_ydai5zblcqm1o5hs0iasex2zdrilqtnl\3.2.0.50049

Inside of the file you'll see a line showing each of the values.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <userSettings>
        <SwqlStudio.Properties.Settings>
            <setting name="PreviousServers" serializeAs="String">
                <value>lab.domain.int;pmhco01.domain.int;rc.domain.int;</value>
            </setting>
            <setting name="PreviousUsers" serializeAs="String">
                <value>...</value>
            </setting>
            <setting name="PreviousServerType" serializeAs="String">
                <value>Orion (v3)</value>
...
...

You're looking for the line that lists all of the connections. You can remove the names and save the file. Make you to keep the syntax correct!

<value>lab.domain.int;pmhco01.domain.int;rc.domain.int;</value>

Thank you for this feedback.