Disable WYSIWYG

Features
11

Yes, I did like this.

usersyle.css

/* For styling the rendered Markdown */
/* Render horizontal lines (made with \-\-\- or \*\*\*) as an actual line across the editor. */
.cm-hr {
  border-top: 3px solid #777;
  display: block;
  line-height: 0px;
}

/*make markdown tokens for list into dots*/
.cm-overlay.cm-rm-list-token.cm-overlay.cm-rm-em-token
    {
color: transparent !important;
background-color: #DECB6B!important; 
height: 6px;
width: 6px;
border-radius: 50%;
display: inline-block;
vertical-align: bottom;
margin: 0 0px 8px 8px;
}

/*lists*/
.cm-variable-2, .cm-variable-3, .cm-keyword {
    color:	green !important;
}

.cm-rm-link {
    text-decoration:underline
}

.cm-strong {
    color:red!important;
    font-weight: bolder!important;
}

/*strikethrough checked boxes*/
span.cm-rm-checkbox.cm-property + span.cm-rm-checkbox ~ span.cm-rm-checkbox {
    text-decoration: line-through;
    color:#5B5B5B!important;
}

/*HEADER STYLES*/
.cm-header-1{
    color: #794BBB!important;
    font-weight:bold;
}

.cm-header-2{
    color: #BD93F9!important;
}

.cm-header-3, .cm-header-4, .cm-header-5, .cm-header-6 {
    color:#CBBBE1!important;
    font-style:italic;
}

.cm-header-1 {
/*    line-height: 200% !important;*/
    display: inline-block; 
    margin-top:.8em;
    margin-bottom:.3em;
}

and userchrome.css

/* For styling the entire Joplin app (except the rendered Markdown, which is defined in `userstyle.css`) */
/* removes the WYSIWYG (MARKDOWN/RICH TEXT) button */
/* …old method (Joplin 3.0.z and older) */
/*div.editor-toolbar div button {
    display: none !important;
}*/
/* …new method (Joplin 3.1.z and newer) */
div.editor-toolbar div button[title="Toggle editors"] {
    display: none !important;
}