All existing tables are with prefix dbo.TableNames
When I create a new table, it creates as login.MyTable instead of dbo.MyTable.
The screenshot is Security > Properties of my login.
Could you please show me step by step (I am not familiar with SQL securites) how to solve this problem?
Thanks in advance!

That means your default schema is your username (assuming that you mean
loginis actually a username likewinand not reallylogin). If you’re using the UI table designers it will select that schema for you. You can try using:But you may not have access to the
dboschema.