But I see a thing ;program looks for http://localhost/magento2/pub/static/version1571915454/frontend/Magento/luma/en_US/fonts/opensans/ folder for some files but Really this version1571915454 folder is not exist
I have same issue to with magento 2.3 on Windows 10, backoffice page show blank page with brown background.
after searching the problem on the web, finally found solution
open file /vendor/magento/framework/View/Element/Template/File/Validator.php
in magento install dir , you will find on LINE NO. 138
$realPath = $this->fileDriver->getRealPath($path);