View in Browser in visible on the top right corner of the Email template.
Please follow the process as mentioned below:
1. Click on the text View in Browser visible on top right corner. please see here
2. On the left hand side, go for the block menu and look out for the section that says Link
3. From the drop down, select View in Browser and tag like this will appear: [General.ClickHereToViewInBrowser]
4. Save the email template and it is ready to be Viewed in browser.