Using Script
http://blog.qumsieh.ca/2010/02/16/hide-columns-in-sharepoint-new-edit-and-disp-forms/

Using Designer 
http://promx.net/en/2016/09/how-to-hide-columns-from-sharepoint-forms/ -


Using Power Shell

First load SharePoint Core Assembly

[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.SharePoint”)

 

$url = "http://ulabtechnologies.sharepoint.com";

$list = "Employee";

$fieldname = "NewColumn";

 

#Setting up context

$contextSite = New-Object Microsoft.SharePoint.SPSite($url);

$contextWeb = $contextSite.OpenWeb();

 

$list = $contextWeb.Lists.TryGetList($list);

$field = $list.Fields[$fieldname];

 

# Controls Field in Edit Form

$field.ShowInEditForm = 1;

# Controls Field in New Form

$field.ShowInNewForm = 0;

# Controls Field in New Form

$field.ShowInDisplayForm = 1;

# Hides fields from list settings

$field.ShowInListSettings = 1;

# Hides fields from version history

$field.ShowInVersionHistory = 1;

# Hides fields form selection in views

$field.ShowInViewForms = 1;

# Don't forget to update this field

$field.Update();

# And finally dispose everything.

$contextWeb.Dispose();

$contextSite.Dispose();