webstorm osx overwrite insert mode and increase selected text shift + arrow

Hi,

I am trying out webstorm on osx 10.13.3 (macbook pro touchbar) and like it except 2 issues:

1) it often gets into overwrite mode and I have to change into insert mode. I haven't been able to narrow down why if happens, but it seems to happen after I do a global search.

2) how on earth can I select text char by char - ie key combination shift plus right arrow to increase the selected text one char at a time. I have looked at the key mappings but nothings seems to fix this. The behaviour instead for this key combo is to move the cursor to the right one word.

I don't see either of the 2 behaviours when I use intellij on the same machine.

Thanks TOm.