After using a PowerApp it displays a prompt for Feedback to Microsoft. This may not be something you want you users to see but it can be disabled by running the following PowerShell script. Note that PowerShell needs to be run as administrator to install the modules (if not already installed).

# Disable PowerApps Feedback prompts

# Install required PowerApps PowerShell modules
Install-Module -Name Microsoft.PowerApps.Administration.PowerShell 
Install-Module -Name Microsoft.PowerApps.PowerShell -AllowClobber 

# Connect to tenant as global admin
Add-PowerAppsAccount

# Display current tenant settings
Get-TenantSettings

# Set SurveyFeedback to disabled
$settings = @{ disableSurveyFeedback = $true } 
Set-TenantSettings $settings 

# Check settings have changed
Get-TenantSettings

Now your users should no longer be prompted for Feedback to Microsoft when using PowerApps.