User Configuration > Administrative Templates > Microsoft Project 2016 > Project Options > Edit > View options for time units in 'Project1'
User
HKCU\software\policies\microsoft\office\16.0\ms project\options\edit
Adds a space between numbers and time unit labels. If you enable this setting, a space is displayed between numbers and the time unit label. If you disable or do not configure this setting, the user's default setting is used.