dashboard

I need to know , how to display on dashboard only current year or month total income , total expenses and total profit ... currently it display combined with 2018 income and expenses

That's not possible, for now.

You can write your code in controller and view. Need to play with codes, Try in  App\Http\Controllers\Common\Dasboard.php and resource view\common\dashboard\index.blade.php

This should go into core! It is quite pointless to show lifetime income and expenses. Or at least a setting that allow default view. For example, 1 month, 3 months, 6 months, 1 year and lifetime