title: unwanted: APL keyboard overlay enabled?
body: <p>I've been trying out APL. I'm running Windows 10 and I've installed Dyalog 18.0, and the APL Language and APL Backtick Symbols extentions for VS Code.</p>
  <p>But even though I'm not running any of these programs, sometimes suddenly my keyboard is hyjacked! All my ctrl commands are replaced by APL symbols.
  E.g. ctrl-Z (undo) becomes ⊂ and ctrl-A (select all) becomes ⍺. I have no idea why and how to disable this again. This makes it very hard to do my work!!!</p>
  <p>I've been googling for this, but haven't found an answer so far. I've looked at the Windows keyboard settings, but it looks normal. The locale settings are also correct.
  I'm now just de-installing everything, but that way I need to reinstall every time I want to try out APL.</p>
  <p>Can somebody tell me what is happening and how to fix it? (And tell me who to complain to that this is a <strong>very</strong> hostile feature)</p>