Sitecore 9.3 - Fix for SXA toolbox doesn't show in experience editor.

While working on SXA, you will always define the page design and partial design but in case if we need to add the placeholder key in the SXA layout, If we add the placeholder key before the 

@Html.Sxa().GridBody()

The application will not show the SXA components menu on the experience editor, to fix that we should keep this placeholder after the default placeholder.

Example -