Explanation 1: it is configured based on the country set by company. Means if you set country as Indonesia, then you will get the calendar based on the Indonesia. If the country is empty, then we would use company creator's country. 

Explanation 2: If the company is from MY and the employee is from SG, the SG employee would see MY calendar instead of SG calendar. This is our app limitation

Step 1: Go to details 

Step 2: Go to Countries

Step 3: Choose your countries