The height for multi-line string fields are set to 200px in all forms when the glide.ui.html.editor system property is set to "htmlarea".

Note the code after inspecting one of the multi-line fields when glide.ui.html.editor is set to "htmlarea".

<textarea id="sys_properties.description" onchange="this.isFocused=false;multiModified(this);" onkeydown="multiKeyDown(this);" style="width: 100%; height: 200px; overflow: hidden; word-wrap: break-word; resize: none;" name="sys_properties.description" wrap="soft" specialtype="" data-length="512" data-charlimit="false" onfocus="this.isFocused=true;" onblur="this.isFocused=false;" class="form-control" aria-required="false" spellcheck="false">HTML field editor to use</textarea> 

Note the code after inspecting the same multi-line fields when glide.ui.html.editor is set to "tinymce":

<textarea id="sys_properties.description" onchange="this.isFocused=false;multiModified(this);" onkeydown="multiKeyDown(this);" style="width: 100%; overflow: hidden; word-wrap: break-word; resize: none; height: 64px;" name="sys_properties.description" wrap="soft" specialtype="" data-length="512" data-charlimit="false" onfocus="this.isFocused=true;" onblur="this.isFocused=false;" class="form-control" aria-required="false" spellcheck="false">HTML field editor to use</textarea>

1. Set the system property glide.ui.html.editor to "htmlarea".

2. Go to any form.

   Note the height for any multi-line field is increased to 200px although it should not be affected.