Include the floating menu in the template.
<ngx-editor [editor]="editor"> <ngx-editor-floating-menu [editor]="editor"></ngx-editor-floating-menu></ngx-editor>
OR
<div class="editor"> <ngx-editor [editor]="editor"> </ngx-editor> <ngx-editor-floating-menu [editor]="editor"></ngx-editor-floating-menu></div>
<div class="editor"> <ngx-editor [editor]="editor"> </ngx-editor> <ngx-editor-floating-menu [editor]="editor"> <ngx-editor-menu [editor]="editor"></ngx-editor-menu> </ngx-editor-floating-menu></div>