As for concentration I firstly make sure your physical needs are covered first so that's making sure you eat regularly, get 8hours sleep and exercise regularly etc.

Then if you are working on a project or something remove all distractions and anything that will stop you from working, grab that coffee and get working.
Also find out if you can change the layout of the page so that all of the toolbars are removed temporary.

Don't forget to sign off all of your messengers and emails

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