Editting problem with ins mode

when editing normal document, and I found
the " ins mode " happened , which is like hitting
ins key in some other editting software which
would happen, that is the cursor replacing the
selected character instead of adding the character
I typed after the cursor.

This happens when I’m using latex text format in dynalist which is katex. i.e $$ text $$

I am not sure if this is normal and looking for
a way to solve it.

Wish to control it in a manner like hitting ins
key.

Environment

Which operating system are you using?
Which browser are you using?
If you’re using a desktop or mobile app, what’s the version number of Dynalist?
Are you using any third-party scripts for Dynalist, e.g. PowerPack?
Windows 10, Asus Notebook X550SV, Chrome
web browser.
web address: dynalist.io


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