How to re-open a webview after it being closed and does not reopen

Question:
How to reopen webview after it being closed. It doesn’t show a button nor is opening.
Repl link/Link to where the bug appears:
In my application.
Screenshots, links, or other helpful context:

code snippet

Click on the plus button to add a new tab.

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Start typing webview in the search bar, then click on the Webview button.

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You will have a Webview tab.

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