This edit removes the watermark from Skyrim Together, working as of 09/09/2020.

I originally posted this to the subreddit but my post was removed, like in my original post I'll include below steps on how to manually make these changes if you'd prefer.

To install this file simply open  your Skyrim SE directory and navigate to "Skyrim Special Edition\Data\Online\UI"  extract then replace "main.js" with the modified file.

Note: Launching through Harbor will revert these changes when it does an integrity check or update so you'll need to launch by executing "st_loader.exe" instead.

Alternatively if you wish to manually make these changes follow the steps below:

1) Navigate to "steamapps\common\Skyrim Special Edition\Data\Online\UI" and open "main.js" in notepad++ or a similar program.

2) Replace line 1811 with:

module.exports = "<ng-container *ngIf=\"inGame\">\n\n <ng-container *ngIf=\"!openingMenu\">\n <app-debug></app-debug>\n\n <app-group></app-group>\n </ng-container>\n\n <app-notification-popup class=\"app-notification-popup\" border=\"strip\" >\n\n </app-notification-popup>\n\n <div class=\"app-root-preview\">\n <div class=\"app-root-preview-stage\">{{ watermark }}</div>\n <div class=\"app-root-preview-build\">{{ version }}</div>\n </div>\n <app-notifications [@notifications]=\"!active\"></app-notifications>\n <div [@controls]=\"active\" class=\"app-root-controls\">\n <app-window *ngIf=\"isnightly || connected || currentUser\" border=\"strip\" class=\"app-root-menu\">\n<button *ngIf=\"isnightly && !connected && !isConnectionInProgress\" (click)=\"view = 'connect'\" data-style-ornament=\"inverted\" [attr.data-style-active]=\"view === 'connect'\">Connect</button>\n<button *ngIf=\"isConnectionInProgress\" (click)=\"view = 'disconnect'\" data-style-ornament=\"inverted\" [attr.data-style-active]=\"view === 'disconnect'\">Connection in progress</button>\n<ng-container *ngIf=\"connected\" >\n <button (click)=\"view = 'disconnect'\" data-style-ornament=\"inverted\" [attr.data-style-active]=\"view === 'disconnect'\">Disconnect</button>\n <button (click)=\"reconnect()\" data-style-ornament=\"inverted\" [attr.data-style-active]=\"view === 'reconnect'\">Reconnect</button>\n</ng-container>\n<button *ngIf=\"currentUser\" (click)=\"view = 'friends'\" data-style-ornament=\"inverted\" [attr.data-style-active]=\"view === 'friends'\">Friends</button>\n </app-window>\n <app-window class=\"app-root-chat\">\n<app-chat #chat></app-chat>\n </app-window>\n </div>\n <div [@popups]=\"active\" class=\"app-root-popups\">\n <app-loading></app-loading>\n <app-popup *ngIf=\"view === 'connect'\">\n<app-connect (done)=\"view = undefined\" (setView)=\"view = $event\"></app-connect>\n </app-popup>\n <app-popup *ngIf=\"view === 'disconnect'\">\n<app-disconnect (done)=\"view = undefined\"></app-disconnect>\n </app-popup>\n <app-popup *ngIf=\"view === 'friends'\">\n<app-friends (done)=\"view = undefined\"></app-friends>\n </app-popup>\n <app-popup *ngIf=\"view === 'serverList'\" data-popup=\"server\">\n<app-server-list (done)=\"view = undefined\"></app-server-list>\n </app-popup>\n\n <app-error></app-error>\n </div>\n</ng-container>\n"

or just remove "Skyrim Together\n" from that line.

3) Comment out line 1909

//return this.client.versionSet.value;

4) Comment out line 4369

// watermarkText: "nightly",

5) Save and Enjoy