@shehab,
Hide course activity and members tab: you can set the privacy from wp-admin > LMS > Settings
refer:
http://prntscr.com/kpwy3d
Redirect users to dashoard: we have the setting for this also, go to wp-admin > LMS > Settings > general Settings >
http://prntscr.com/kpwyl0
Login issue: Please paste this custom css in wp-admin > Appearance > Customize > custom css
.logged-out #vibe_bp_login .popup_login #vbp-login-form .inside_login_form .inside input[type=text]
{ text-transform: initial !important;}