Editing SXA Searchbox rendering parameters thru powershell

Question

I am trying to update the 'Search results signature' and Suggestion mode of SXA Search box rendering of items thru below powershell script but it is adding new parameter at the bottom instead of updating the existing parameter

$item = Get-Item -Path "master" -ID "{58FFC28D-D04E-476B-9E59-EEE087A4F54D}"
$renderingItemId = "{EECE4E4B-4E5F-42FD-A934-7AFD048AFD03}"
$placeholderId = "/main/container-1/row-2-2/container-8/column-2-9"

# Accepts Hashtable, Ordered Dictionaries, etc.
$parameters = [ordered]@{"Search results signature"="globalsearch"}
Get-Rendering -Item $item -FinalLayout |
    Where-Object { $_.Placeholder -eq $placeholderId -and $_.ItemID -eq $renderingItemId } |
    Set-RenderingParameter -Parameter $parameters| 
    Set-Rendering -Item $item -FinalLayout

Answer 1

I just found the below working after some struggle. Like scriban we should be using the template field names which we can find from the parameter template of the rendering.

    $item = Get-Item -Path "master" -ID "{BB57FDB9-7A8F-424B-B59B-94B129E607FD}"
$renderingItemId = "{EECE4E4B-4E5F-42FD-A934-7AFD048AFD03}"
$placeholderId = "/main/container-1/row-2-2/container-8/column-2-9"

# Accepts Hashtable, Ordered Dictionaries, etc.
$parameters = [ordered]@{"SearchSignature"="globalsearch";"SuggestionsMode"="ShowPredictions"}
Get-Rendering -Item $item -FinalLayout |
    Where-Object { $_.Placeholder -eq $placeholderId -and $_.ItemID -eq $renderingItemId } |
    Set-RenderingParameter -Parameter $parameters -Overwrite| 
    Set-Rendering -Item $item -FinalLayout