outlook, calendar , office 365

i am suppose to create a calendar to be shared with whole company

since we have mailboxes in office 365 and no on premise exchange server, only on premise Active directory for which AD user objects are synced through AAD sync to Azure AD.

So i created shared mailbox in office 365 and tried to gain access to that mailbox and shared calendar through OWA to few users.

i see that shared calendar showing in users outlook but it is not showing in those users directly under MY Calendar option

instead it is showing as under other or shared calendar

is there any way i can put that shared calendar under users my calendar option

i gave full access but it still shows under other calendar