Policy
Delay before starting background spelling checker
This policy setting allows you to configure when the background spell check is started. If you enable this policy setting, you may specify the delay, in milliseconds, before the background spell check is started. This setting only applies when Word is running in a terminal server session. If you disable or do not configure this policy setting, Word will behave normally when in a terminal server session.
bf178a4c19cc L_Delaybeforestartingbackgroundspellingchecker Registry
Copy registry mappings
HKCU\software\policies\microsoft\office\16.0\word\options\terminalserverspellingstart Policy notes
This policy setting allows you to configure when the background spell check is started. If you enable this policy setting, you may specify the delay, in milliseconds, before the background spell check is started. This setting only applies when Word is running in a terminal server session. If you disable or do not configure this policy setting, Word will behave normally when in a terminal server session.