1\I just wondering if there is any influence after I change report suites site title?
Will the previous or future data be influneced?
Do I need to change other settings in Adobe Launch or do something else after changing the site title?
2\how about changing the name of evar/props/event. will there be any influence?
From my understanding, there shouldn't be any impact as the tracking is dependent on the report suite ID and not custom name. The same is applicable for evars/props/events as well.