Configure the option "Show rulers" (File | Options)

Here you can configure if Presentations shows rulers.

Supported on: At least Windows Vista
Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry PathSOFTWARE\Policies\SoftMaker\Presentations 2018
Value NameShowRulers
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

softmaker.admx

Administrative Templates (Computers)

Administrative Templates (Users)