How do I change or remove the ‘Estimated Completion Date’ field?

If you don't want to have a date field in the Estimated Completion Date, you can change this block to be a normal text field by following the steps below: 

1

Hide the default Project Status section from global settings or the project settings. ( See how to hide the default project status section here).

2

Switch the "General Information" editor to the "Text" mode, and paste the below snippet at the end of the content.

3

Change the {TEXT} and {PHASE} in the content accordingly.

Paste this snippet into your General Information editor:

<div class="project-status vertical-padding completed-no">
  <div class="inner-width">
    <div class="column current">
      <span class="value">{TEXT}</span>
      <span class="label">{PHASE}</span>
    </div>
    <div class="column next">
      <span class="value">{TEXT}</span>
      <span class="label">{PHASE}</span>
    </div>
    <div class="column completion-date">
      <span class="value">{TEXT}</span>
      <span class="label">{PHASE}</span>
    </div>
  </div>
</div>