Location of list of features (default location)
c:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\TEMPLATE\FEATURES\
Check for Site collection level or subsite level!
To check Features enable or disable
Site Settings > Under Site Action \ Manage Site Feature (/_layouts/15/ManageFeatures.aspx)
Also Cheeck Feature is enable or disable from Site Collection Level
Site Settings > Site Collection Administration \ Site Collection features
(_layouts/15/ManageFeatures.aspx?Scope=Site)
Get-SPFeature -Site http://sitename/sites/yoursite | out-gridview
Get the name of required feature – example below is SharePoint Server Enterprise Site Features
Set feature value to variable
$SharePointServerEnterpriseSitefeatures="0806d127-06e6-447a-980e-2e90b03101b8"
Search if available
Get-SPFeature -Site http://sitename/sites/yoursite | where {$_.Id -eq $SharePointServerEnterpriseSitefeatures}
Enable the feature
Enable-SPFeature -Url http://sitename/sites/yoursite -Identity $SharePointServerEnterpriseSitefeatures -Confirm:$false -Force
Disable feature
Disable-SPFeature -Url http://sitename/sites/yoursite -Identity $SharePointServerEnterpriseSitefeatures -Confirm:$false
IMPORTANT NOTE: After making these changes it could take 24 hours for the changes to appear or depend upon the size of your farm.
List of all SP: https://blogs.msdn.microsoft.com/razi/2013/10/28/listing-all-sharepoint-server-2013-features-including-name-title-scope-id-and-description/