Acer Iconia B3A40 How to stop tablet going to sleep after 30 seconds

I have an elderly Acer Iconia B3A40 .Some months ago it went into Demo mode.I think that this happened after a menu of options appeared on my screen ,possibly controlled by the power of volume buttons.With great difficulty I managed to stop the Demo acting although the phrase Demo mode is on the bottom left of my screen all the time!A few weeks ago the tablet started going to sleep very often.I went to Display in settings but it where the sleep setting is,is shadded out -though I can read that it is set at 30 seconds. I cannot change that and I want to set it at 30 mins or something like that.Any suggestions much appreciated.

[Edited the thread to add model name to the title]

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GAMING6698

https://community.acer.com/en/discussion/700475/acer-iconia-b3a40-how-to-stop-tablet-going-to-sleep-after-30-seconds

Tap on Apps in home screen – Settings – Storage – Internal Storage – Apps – Scroll down and Identify “Demo Video Application” under the apps list . Tap on Clear Cache and tab on “Disable”, Ignore the warning message.

Now try to change screen

CRAIB

Many thanks. I do not have an”Internal Storage”. I do have an “Internal Saved Storage” with an “Apps” but no Demo at all in the list of Apps

billsey

Typically you have to be in Developer mode to enable the Demo mode. So, go into settings; developer; and disable demo mode there.

CRAIB

Very many thanks. I am

IMG_6376.jpeg

sorry to be awkward but demo mode is disabled. It is “greyed out” in the list for developer and if you tap o it you see that both”enable demo mode “ and “show demo mode” are switched off. I tried switching them on then off but that had no effect.

I wonder if I did something on the “menu of options” which I mentioned appeared , uninvited, on the screen below the pier and volume buttons. The menu was extensive but U have been quite unable to get it back . I have a number of symbols on the top left hand of the screen as shown in the photo, and cannot work out what they mean or do? Again my thanks for you help.

billsey

Yeah, that model is old enough that even the couple of tablets I still have around handy don't have the same features, so I can't try to duplicate here at home.