To find ID in Squarespace, you can follow these.
#1. First, install this tool to your browser.
#2. Next, Click on the Extensions icon
and Pin it to browser bar
#3. Open the page containing the block/or section you need to find the ID.
Then click Squarespace ID Finder icon
#4. All IDs will appear on page.
You can click on ID to copy it.
In this screenshot, you will see 2 Block IDs and 1 Section ID
