Short Answer 
To remove the sandbox restrictions from an iframe, first locate the iframe tag in your HTML code, then delete the sandbox attribute. Finally, save your changes and refresh the webpage to observe the modifications, keeping in mind the security implications of lifting these restrictions.
Step 1: Locate the iframe Tag
Start by finding the iframe tag in your HTML code. You need to identify the specific iframe that has the sandbox attributes attached. The tag typically looks like this:
<iframe src="example.html" sandbox="allow-scripts allow-same-origin"></iframe>
Step 2: Remove the Sandbox Attribute
Once you’ve located the iframe tag, look for the sandbox attribute within it. Simply delete the entire sandbox attribute to lift the restrictions, allowing the content within the iframe to operate without those security limitations. After editing, your iframe should appear as follows:
<iframe src="example.html"></iframe>
Step 3: Save and Test the Changes
After making the changes, save your HTML file and refresh the webpage to see the effect of the modifications. Check for any new interactions or functionalities in the content loaded by the iframe. Remember that removing the sandbox attribute will make the iframe content operate with the same permissions as the parent page, so ensure this aligns with your security requirements.