What will {EncodedTitle} do & Can I replace the underscore it adds?

Title

URL Name

EncodedTitle

Question

Answer

What will {EncodedTitle} do to my naming convention?

{EncodedTitle} is most commonly used to remove any spaces from the name of a workspace and replace it with an underscore.
For example, if the name specified was Marketing Department, then the URL would be https://tenantname.sharepoint.com/sites/Site_Marketing_Department

This will also:

Replace the following characters with an underscore: " .,:;<>@[]\()$&+/=?#%{}|^~`’ if there were more than 1 replacements in a row this would be replaced with a single underscore.
Removes diacritics, e.g. ä will become a.
Replaces language-specific special characters with their equivalent. Includes the following: ß,æ,Æ,œ,Œ,ø,Ø,ł,Ł,ı

As part of your naming convention you may not want to use underscores for these, using the instructions below you can replace _ with something else, using a Request Variable:

Replace underscores in {EncodedTitle}

Our example, replace /new_teams_url to use hyphens instead e.g. /new-teams-url or no separator /newteamsurl

Go to Admin > Templates > Request Variables
Click +New Request Variable
1. Set a unique identifier for this variable. e.g. 'NewEncodedTitle'
2. Set the Output type = String
3. In the Formula field use the following: {EncodedTitle}.Replace("_","-") or {EncodedTitle}.Replace("_","")
Link the Request Variable to the Service Definition by going to Admin > Service Definition > Request > Request Variable Reference
Click +Add Reference
Select the name of the Request Variable created earlier.
Add the Request Variable name to the Title formula or URL format wrapped in { }
Save the Service Definition