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Please check the below steps for making the read only fields.
1. Click on the Setting icon at the right side of field.
2. After clicking the setting icon, a menu popup will appear. After that need to click on the last link of that menu popup "Edit Properties".
3. Once you will click on "Edit Properties", a new popup window will appear. In that popup window, there is the last option of "General setting" as "Read only".
4. Need to make that "Read only" properties to "Yes"
Please check below 2 screenshots for more clarification: