How to remove (base) from Powershell?

The (base) notatation is there to tell you which virtual environment that you are on. This is very useful when you are using different environments on the same system.

If you are not doing anything in python, you can run conda deactivate until you want need to use the python environment. You can stop it auto activating with conda config --set auto_activate_base false

Obviously your prompt function was modified, presumably by one of the profiles.

View the definition with:

(Get-Command prompt).Definition

And see if you can evaluate the origin by viewing the possible profile files:

$PROFILE|Format-List -Force

You could also let powershell do the work:

## Q:\Test\2019\07\21\SU_1462281.ps1

$PROFILE.PSObject.Properties | 
  Where-Object Membertype -eq Noteproperty | ForEach-Object{
    if (Test-Path $_.Value){
      Select-String -Path $_.Value -Pattern 'function\s*prompt'
    }
  }
#

Sample output, which contains found Path:LineNumber:Line

C:\Users\LotPings\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1:69:function Prompt {